Busy executives love it because they can walk out of their office and step into your mobile gym trailer. There, you’ll put them through their paces with a quick yet challenging routine that works all the major muscle groups. For workers taking time out of their hectic days, this usually consists of heavy weights lifted slowly. This ingenious method ensures that the worker gets physically fit without working up a sweat. After all, they don’t want to return to their cubicles dripping in perspiration. Not working up a sweat also means they’re free of the need to change into their gym clothes or shower afterward.