Planks strengthen the upper, middle, and lower back muscles as they work to maintain proper spinal alignment and prevent the lower back from sagging or overextending, Marcotte says.

Planks are the ultimate test of total-body strength—not just your core. A personal trainer breaks down how to do proper planks and the muscles that planks work.

Planks are a classic core training exercise, but what muscles do you actually work when you hold a plank? Here's the answer, along with the proper form.

What muscles do squats work? How to correctly do a squat and the benefits for your body. Daryl Austin. Once again, 30-day fitness challenges are all the rage on social media.

All of your body is interconnected, so the muscles work together and affect each other. Each plays a major part in your movements and posture. Muscle Health.