This video will kick your butt! And as a previous reviewer stated probably have you swearing, but it is definitely not for people who aren't familiar with exercise. I am fairly active and fit, however I'm just getting back into 'working out' and found a number of things in this video too hard to do, especially as a woman without as much upper body strength as a man usually has, most notable the plank/push-up exercises. Being familiar with exercise I was able to modify the exercises I couldn't do myself, so I could keep moving instead of giving up, but the instructor never once offered a modification, which any good instructor normally does. Also no stretching! Stretching is SO important & often neglected in these videos who want to hook you with a full body work-out in only 45 mins, you'll end up with a full body tightness!