Mark talks about the PBF as doing a lot of low level stuff like walking 2-5 hours a week, sprinting once every week/10days and doing the 4 basic exercises a couple times a week.

I've always heard the your abs are the only muscle you can work everyday. NOt sure if that is right or not. My abs are really bad and my muscle in my upper body has been lost in the last few years.

Any problem with doing abs every other day along with some sort of resistance for arms etc?

Thanks in advance