Calf raises, step downs, and step ups are crucial exercises for maintaining stair climbing ability and overall mobility as we age. Calf raises strengthen the calf muscles, improve ankle stability, and enhance balance, reducing fall risks. Step downs target the quadriceps, glutes, and calves, aiding in controlled descent and improving coordination. Step ups build strength in the quadriceps, glutes, and hamstrings, essential for climbing stairs and rising from chairs. Together, these exercises enh