Wall sit

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This exercise strengthens your back, trunk, and thigh muscles, helping you maintain a healthy lower back.

Stand with your back 10 in. (25 cm) to 12 in. (32 cm) away from a wall.

Lean into the wall until your back is flat against it.

Slowly slide down until your knees are slightly bent, pressing your lower back into the wall.

Hold for a count of 10, then slide back up the wall.

Repeat 10 times.

From MSN Health