You can reserve the training center (find a way to add a waiver when registering for those) if the spot is open. Registration is for for half an hour intervals and you can book consecutive windows if you want longer rental period. If a block of time is open for booking it would be clickable and you can select "Drop in" and pay. If a block of time is not open it would be crossed out. 

Price is $10 per half and hour block for non members and $8 for members (that can be changed)

Address:

219 Blackhorse Lane
North Brunswick, NJ 08902