Leg Bender is a term used to describe an exercise that focuses on the muscles in the legs, specifically the knees. It involves bending the KNEE joint and stretching the leg muscles to increase flexibility and strength. The crossword solution for Leg Bender is 'KNEE, ' which is a four-letter word. KNEE is the joint located between the thigh and lower leg, and it is the main focus of the Leg Bender exercise.