Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

Claw foot is sometimes called claw toe or hammertoe. It is a condition where your toes are bent into a claw shape. You may be born with claw foot or you may develop it later in life. Here’s what you ...