Solution: Flood those muscles with oxygen, a key ingredient your cells need to create energy.

Your back muscles need both strength and conditioning to perform their functions properly.

You're not tired but your muscles need to get used to the sudden shock of navvying.

The muscles of the right arm needed all the blood they could get.

He said all muscles need to be used gently before tackling the strong-arm work.

I'd say your heart and other muscles at least need some toning up.

My muscles need to relax, I tell myself over and over again.

It could even be harmful since muscles need a day of rest between strengthening sessions.

Her abused muscles needed soothing, and the doctor had recommended this sort of therapy.

Though a good soaking in icy water might be just what her tired muscles needed to revive them.