When people are looking to purchase a muscle building program they often look for the one which doesn't require much effort. Sadly these programs won't get you the results you are looking for. Both the P90X and TRX will give you amazing results if effort is put in. The P90X is the hardest program on the market which will require you to give it your all for 90 Days. After each workout your muscles will be worked more than ever before. Unlike P90X TRX can work with your schedule and you can decide to do the workouts whenever it's possible for you. It can be attached in less than 2 minutes and is very easy to use.