The wall sit 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. (30 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 about 6 seconds. Then slide back up the wall.
• Repeat 8 to 12 times.