Touchtennis

Touchtennis is a modified version of tennis played on a compact court with foam balls and shorter () racquets. It is regularly featured on Sky Sports and is growing in popularity and acceptance as an alternative form of the full size game. 
Former and current ATP Players include Fernando Gonzalez, Marcus Willis, Jeff Tarango and Chris Eaton. TV personality Bear Grylls plays tournaments and is a vocal supporter as is comedian Miranda Hart. 
It is also used as a tool by the Lawn Tennis Association in the United Kingdom and the RFET in Spain to increase the number of people playing an adaptation of tennis.
History.
touchtennis was created by Rashid Ahmad as a means of entertaining his young daughter in the back garden. It was developed to include a tour, complete with rankings, 4 major Grand Slams as well as Masters events and other smaller tournaments that offer a lower value of ranking points. 
Equipment.
Racquets.
The official touchtennis racquets must be no shorter than and no longer than . Most manufacturers' "21 inch" racquets fall within this variation despite being labelled as in length. The racquets head size may be no greater than .
Balls.
Special foam balls have been developed to withstand heavy hitting. The official ball of touchtennis is in diameter and made from cut foam. The official ball has the touchtennis trademarked logo on it.
Court.
The dimensions of an official touchtennis court are for singles and for doubles. However, variances of up to are tolerated on all lines in order to make the game more accessible and varied. Mini red/10 and Under Tennis dimensions are perfectly suitable. Players can also utilize a badminton court by lowering the net and taping a new service line away from the badminton service line towards the baseline.