“Show” muscles or “Go” muscles, what is your Goal?

Every sportsperson or fitness freak aims to achieve these ‘landmarks’, as these are considered to be prerequisites of the fitness and strength.
Beware!! These are just the ‘show’ muscles, the muscles you can see when you stand in front of a mirror.
Have we thought about our ‘Go’ muscles?? Most of us have not.
That’s why we encounter problems like hamstring pull, severe IT Band tightness, groin pain, low back spasm, neck spasm, very tight calf muscles, heel pain, and major injuries like shin splints, stress fractures, calf or thigh muscle tear etc. etc.
All these problems or injuries can be avoided to a greater extent if one develops ‘Go muscles’, i.e. ‘Posterior chain muscles’ along with ‘show muscles’.