Squats and lunges are great exercises to try to build strength in your body. But you need to maintain the proper form throughout your workout though. The Squat Sponge can help. It allows you to perform proper form of squats and lunges. It is 18″ long, 3.5″diameter, and 1.25″ thick.
The Squat Sponge provides additional support for the upper, lower back, and abdomen area during exercises with a barbell. Sets you back under $25.