I’ve been into fitness all my adult life since getting out of the USMC back in the early ’90s. Biking, weights and martial arts mostly.
I found simplefit.org and think this is an excellent yet simple workout program. I’m a big believer in keeping it simple. I tried the crossfit work outs but found them to be too convoluted and equipment dependent.
I started at level 6 two weeks ago. For me seems to be a good starting point. I have added a max set of incline sit ups as a warm up and like to do some stairclimber (18-36 min) at the end.