Princible of prgress

Exercising is simple. You workout to get tiered and recover to get stronger. What you do is what you get. If you lift heavy weights, you get stronger and if you lift light weights, but more reps, you get more endurance. If you run, you'll be a better runner.

This is so easy!

In theory - yes, but in reality, you also have to do the work and also the RECOVERY. The balance of work - recovery is where it gets fuzzy and combination of multiple abilities makes even more demanding.

Maybe one good rules is to work on what is your NO SO GOOD ability? (Unless you are an active sportsman, then you have to develop your strong points?)