The disease sheared him of his physical strength.

He exhausted all his energy.

His powers are failing.

His strength slowly declined.

His strength is waning.

Age diminished his strength.

Save your strength.

Try to build up your strength.

You must eat properly to keep up your strength.

I am exhausted.

Women are physically weaker than men.

My physical power has decayed.

We took pride in our strength.

Eat more, or you won't gain strength.

Tom has grown in strength.

The old lady has been rather feeble since her illness.

There is also one type of idealism that says even without strength or intelligence you can do anything if you can merely persist.

I'm going to a training camp tomorrow. However it's not the physical side that I'll be training, but the mental.

As humans age, their physical strength declines.

Physical strength is an important attribute as far as search and rescue dogs are concerned.