What does a calf strain usually feel like?

Calf strain means-: -injury 2 the muscle in the back side of the lower leg. 1st degree=stiff, sore &pain with push off in walking, but loosens up as U warm up. clears in a few days. 2nd degree , tearing of some muscle fibers . swelling = =/- bruising. very painful 2 walk & no improvement with warming up. 3rd degree massive tearing, hematoma, tight compartment, & needs immediate ortho care.