An extra-firm mattress makes a difference in your alignment and sleep quality. Our picks for the best extra-firm mattresses include Plank Firm, Titan Plus and others.

Here are seven best ... more fun. Planks are the OG ab exercise—they look simple, but the burn is real. They engage your ...

In addition, targeted exercises can increase the blood flow to the lower back area, which can help reduce stiffness. Pair these exercises with one of the best office ... The plank is a killer ...

The best arm ... forearm plank with your elbows on the ground and shoulders directly over your elbows. 2. Push up through your shoulders and send your hips into the air creating a "V" position.