Phenomenal

Absolutely amazing, useful, helpful and for the bundle of all the integrated apps well worth the $9. I was a fitness but but fell off the wagon 6 yrs ago and getting back into it, I always over exerted myself thinking I could do more than I actually could/should. This forces you to start slow and light gradually increasing reps and exercises from beginner, intermediate and finally advanced. Highly recommended. As long as you stay true to yourself and have the mindset to reach your goals this is perfect for you.

Krypsilver about Butt workout: squat challenge, v5.0