"Peak fitness" refers to the highest level of physical condition or overall health that a person can achieve. It indicates that someone is at their best physical state, typically exhibiting strength, endurance, and good health. Full definition
One huge advantage of peak fitness exercise is that a gym is not required. (ahealthblog.com)
I also believe that to reach peak fitness you need to experiment with your fitness routine to find out what is the best way for you to train. (fitnesswayne.com)