I buy a use set of Powerblocks -lrb- `` Personal '' edition -rrb- on Craigslist about 7 week ago and be happy I do . amazingly quick to switch weight , simple to use and take up hardly a blip of space at all . the compact design of the Powerblocks be one of my favorite thing about they . other design I find way too long and very awkward to use for some exercise . I have the Powerblocks and a incline dumbell bench in a corner of my garage -- I use maybe 8 square foot of space . with the Powerblocks , my workout be quick and streamlined . the strength\/core training of the program I be on take just 15-20 minute to complete and use only dumbell and the bench for equipment -lrb- for the `` cardio '' phase of the program , I run outside -rrb- . I use Harley Pasternak 's ,  5-factor Fitness : the Diet and Fitness Secret of Hollywood 's a-list  the Powerblocks and 5ff work perfectly for my goal . I be 45 year old and have a total of 20 to 25 pound of scale-weight I would like to lose . accord to the scale , so far I have lose 13 pound in 7 week . it be hard to say how many pound of body fat that would be , since I have gain a fair amount of lean muscle mass simultaneously -- my guess be close to 17 pound of body fat be go . I enjoy work out and eat well and all the health and energy benefit of a fit lifestyle , but at this stage of my life , workout need to be short and efficient -- never so long that I get burn out . the Powerblocks -lrb- and 5 factor Fitness -rrb- be work really well for that . best of all , I can workout really hard , because I know I 'll be do in less than 30 minute . the only reason 4 and not 5 star be that several time I have wish I have the flexibility of 2 1\/2 pound increment rather than 5 pound increment , but this be a pretty minor quibble . Powerblocks be the best fitness investment I have make .