If you don’t sleep with a pillow, or if your posture is off while you sleep, this can lead to neck pain. This is especially true for back or side sleepers because they are more likely to overextend or crane their necks without support. This in turn could cause anything from headaches to tension aches.

Fact

Scheduling in rest days gives your body the time it needs to recover and improve.

Myth

You need to drink at least eight glasses of water every day.

The amount of water you need daily depends on several different factors, like your overall health, your activity levels, and where you live. No single number applies to humans across the board—some people may be perfectly hydrated with fewer than eight glasses and others might need more.