Below is the standing pelvic tuck back care exercise. Great for your pelvic floor of course and also helps with the strengthening of your lower back.
Stand with your back to the wall and your knees fairly straight
Contract your abdominal muscles so that your pelvis tucks underneath you and the curve in your lumbar spine flattens.
Hold for 3 seconds. Repeat 10-20 times.
See the image below to get a good look at how the standing pelvic tuck should be performed