fig1 - 1b depict various views of embodiments of the present device . fig1 depicts a perspective exterior view of one embodiment of the present device . in some embodiments , a housing 102 can comprise a plurality of sections 104 , which can be coupled together and substantially vertically arranged . in such embodiments , sections 104 can move independently of each other , or in coordinated movements with each other . however , in other embodiments , a housing 102 can comprise a single hollow member . as shown in fig1 , a housing 102 can be substantially circular in shape , but in other embodiments can have any other known and / or convenient geometry . in some embodiments , a housing 102 can be made of a resilient plastic , polymer , polycarbonate , metal , alloy , or any other known and / or convenient material . as shown in fig1 , a housing 102 can be coupled with a time mechanism 120 , such as but not limited to , a timer , stopwatch , clock , and / or any other known and / or convenient mechanism for timing a user and / or displaying time . as shown in fig1 a , a plurality of moving agencies 106 can be coupled with a housing 102 . moving agencies 106 can be wheels , casters , bearings , or any other known and / or convenient device . in some embodiments , moving agencies 106 can have a rotational range of motion of 360 degrees , or any other known and / or convenient range . as shown in fig1 a , moving agencies 106 can be coupled with a housing 102 at points on the underside of and , in some embodiments , substantially proximal to the periphery of a housing 102 . however , in other embodiments , moving agencies 106 can be coupled with a housing 102 in any known and / or convenient locations . in some embodiments , one of the moving agencies 106 can be configured to drive a housing 102 in any desired direction . in some embodiments , the moving agencies 106 can be configured to randomly drive a housing 102 in any direction . in alternate embodiments , more than one of the moving agencies 106 can be configured to drive the housing 102 either separately and / or simultaneously . in some embodiments , a switch 108 can be located on the top surface of a housing 102 , but in other embodiments can be located on a side or underside surface . an on - off switch 108 can be adapted to selectively control the operation of the moving agencies 106 , drive system 114 , and / or power the device on and off . in the embodiment depicted in fig1 , a housing 102 can include an opening 110 adapted to receive a shut - off unit 112 . in some embodiments , an opening 110 can be substantially circular , but in other embodiments can have any other known and / or convenient geometry . in the embodiment depicted in fig1 , a shut - off unit 112 can be selectively and operatively mated with an opening 110 such that a device will not be propelled when a shut - off unit 112 is not mated with an opening 110 . a shut - off unit 112 can have a substantially cylindrical shape , as shown in fig1 , but in other embodiments can have any other known and / or convenient geometry . in some embodiments a shut - off unit 112 can be magnetized in a desired configuration and an opening 110 can include a magnetic reader such that the pattern and / or random sequence can be defined by the magnetic configuration of a shut - off unit 112 and / or the speed of insertion of a shut - off unit 112 into an opening 110 . as shown in fig1 a , a drive device 114 can be coupled to a drive agency 116 and coupled to a power supply 118 . in some embodiments , a power supply 118 can be a battery , but in other embodiments can be a solar cell or any other known and / or convenient device . in some embodiments , a drive device 114 can be a motor , but in other embodiments can be any other known and / or convenient mechanism . in the embodiment shown in fig1 a , a drive agency 116 can be at least one wheel , but in other embodiments can be a caster , bearing , or any other known and / or convenient device . in alternate embodiments , a drive device 114 can further comprise a pump and / or turbine system . in such embodiments , a drive agency 116 can be a nozzle , propeller , or any other known and / or convenient device to produce thrust . in such embodiments , moving agencies 106 can be fins or any other known and / or convenient device . fig2 depicts a detail view of one embodiment of a shut - off device 112 . as shown in fig2 , a shut - off device 112 can further comprise a visual enhancement device 202 that can be a flag , two - dimensional or three - dimensional graphic , or any other known and / or convenient device . a shut - off unit 112 can further comprise a control mechanism 204 that can control stop - and - go motion of the device . in some embodiments , a control mechanism 204 can comprise an electrical coupling 206 that when disrupted causes the device to cease motion . in some embodiments , an electrical coupling 206 can further comprise magnetic components . however , in other embodiments , any other known and / or convenient control mechanism can be used . in some embodiments , as shown in fig2 , a shut - off unit 112 can further comprise a motion - control device 208 , which can further comprise at least one magnet 210 . in some embodiments , a motion - control device 208 can be a magnetostatic device with said at least one magnet 210 capable of producing an electrical current that can be used to create a seed value for input into a random - pattern generator . a reader 212 can be located in an opening 110 such that a pattern and / or random sequence can be defined by a magnetic configuration of at least one magnet 210 on a shut - off unit 112 and / or the speed of insertion of a shut - off unit into an opening 110 . fig3 depicts another embodiment of the present device , further comprising a remote - control unit 302 . a remote - control unit 302 can operate via a wireless connection or any other known and / or convenient mechanism . fig4 depicts an electro - mechanical schematic of one embodiment of the present device . a drive - control circuit 402 and a directional - control circuit 404 can both be connected to a central processing unit ( cpu ) 406 . a cpu 406 can be connected to an input device / receiver 408 , which can be connected to a power supply 410 . a motion - control device 208 can be connected to an input device / receiver 408 via an op - amp circuit 412 . a remote - control 302 can also provide input to an input device / receiver 408 via a wireless connection or any other known and / or convenient method . in some embodiments , a cpu 406 can also be capable of collecting motion information from the device and connecting to an external personal computer to download such information . further , in some alternate embodiments , a device can include a timing mechanism 120 ( as shown in fig1 ) to record and optionally display chronological information regarding motion of the device . in a drive - control circuit 402 , a power supply 118 can be connected to a shut - off device 112 , an on - off switch 108 , a drive device 114 , and a resistor 414 , in some embodiments , a drive device 114 can be a motor , but in other embodiments can be any other known and / or convenient device . as shown in fig2 , a power supply 118 can be a variable power supply , or in other embodiments can be any other known and / or convenient device . in a directional - control circuit 404 , a power supply 416 can be connected to a resistor 418 and a drive device 420 . in some embodiments , a drive device 420 can be a motor , but in other embodiments can be any other known and / or convenient device . a cpu 406 can be connected to a power supply 118 for a drive circuit 402 via an amplifier 422 , and also to a power supply 416 for a directional - control circuit 404 via and amplifier 242 . in such embodiments , a cpu can , therefore , provide input to control a drive circuit 402 and a directional - control circuit 404 . a remote - control unit 302 can provide input concerning direction , speed , on / off status , or any other known and / or desired parameters to an input device / receiver 408 . as shown in fig4 , a motion - control device 208 can , in some embodiments , be incorporated into a shut - off device 112 . a magnet 210 on a shut - off device 112 can , when in motion , produce a current that can be read by a reader 212 . an induced current can vary depending upon the orientation of magnets 210 in relation to readers 212 and the speed of magnets 210 in moving past readers 212 . in embodiments having multiple magnets 210 and readers 212 , as shown in fig4 , the electrical signals resulting from an induced current can be summed in an op - amp circuit 412 and sent to a cpu 406 via an input device / receiver 408 . a cpu 406 can process these electrical signals to provide control information to a drive - control circuit 402 and a directional - control circuit 404 by using electrical signals to establish a seed value for a random - number generator in a cpu 406 . in some embodiments , a random number generator can translate an electrical signal into numerical values . in such embodiments , a numerical value can be parsed into separate values , each of which can be used to control speed and direction . for example , in some embodiments , a numerical value can have a plurality of digits . one or more digits can correspond to a seed value for speed control , one or more other digits can correspond to a seed value for the control time period , and at least one remaining digit can correspond to a seed value for directional control . fig5 depicts another embodiment of the present device that can operate in an aquatic environment . such embodiments can further comprise a flotation device 502 , which can be located circumferentially around a housing 102 , or in any other known and / or convenient position . in some embodiments , a housing 102 can be comprised of a buoyant material . fig6 depicts a side view of another embodiment of the present device . in some embodiments , a housing 102 can include extension arms 602 adapted to reduce the likelihood of overturning the device . moreover , in some embodiments the shut - off unit 112 can be coupled with an object 604 . in some embodiments , an object 604 can have the shape of a rabbit and / or any desired shape . in some embodiments , a shut - off unit 112 can include a depression 216 that can mate with a protrusion at the base of the opening 110 . in some embodiments , the protrusion can be coupled with a rotational motor 608 such that as the motor rotates , both the drive agency 116 and the object 604 can rotate in unison . in alternate embodiments , the object 604 and drive agency 116 can move and / or rotate independently . in use , a user can turn a switch 108 to the “ on ” position and insert a shut - off unit 112 into an opening 110 . the present device can then begin to move about and be chased by a person , who could have the goal of overtaking the device and removing the shut - off unit 112 , which would cause the device to stop moving . a person can also chase the device without the goal of removing a shut - off unit 112 , but rather to follow a prescribed pattern . in some embodiments , motion of the device can be determined by a magnetostatic device that produces a random movement pattern . in other embodiments , motion can be controlled by a remote user via a remote - control unit 302 . either way , the erratic movement of the present device can require the person chasing the device to change motion quickly , and , therefore , develop speed and agility . although the method has been described in conjunction with specific embodiments thereof , it is evident that many alternatives , modifications and variations will be apparent to those skilled in the art . accordingly , the method as described and hereinafter claimed is intended to embrace all such alternatives , modifications and variations that fall within the spirit and broad scope of the appended claims .
an athletic training device to develop speed and agility . a robot can be programmed or remote controlled to move in an erratic manner so that it can be chased by an athlete . an on - board shut - off unit stops the device when it is removed by the athlete chasing the device .