Your statement is correct. But, after poking around the site, none of the exercises demonstrated ‘isolate’ specific muscles. They are all free weight and body w

Your statement is correct. But, after poking around the site, none of the exercises demonstrated ‘isolate’ specific muscles. They are all free weight and body weight moves. These moves will never isolate specific muscles, and do precisely what you suggest. They work many groups, and smaller stabilization muscles at the same time. The only way you can really isolate specific muscles is to use static machines. Still better than not working out, but not optimal. So fear not, these are all great moves to learn! Just be careful to take it slow, and practice good technique. Not worth getting injured from being careless. This seems to be more of, pick muscle I want to improve, and learn a few moves that involve those muscles. As you would expect, a lot of moves apply to multiple muscles. Edit: I found a few machine workouts on there, mostly leg stuff. The large majority are free weight moves though.