Poor distance vision is rarely caused by genetics, says Anne Barber, O.D., an optometrist in Tacoma, Washington. “It’s usually caused by near-point stress.” In other words, staring at your computer screen for too long. So flex your way to 20/20 vision. Every few hours during the day, close your eyes, tense your body, take a deep breath, and, after a few seconds, release your breath and muscles at the same time. Tightening and releasing muscles such as the biceps and glutes can trick involuntary muscles — like the eyes — into relaxing as well.

Trying to quell first-date jitters? Blow on your thumb. The vagus nerve, which governs heart rate, can be controlled through breathing, says Ben Abo, an emergency medical- services specialist at the University of Pittsburgh. It’ll get your heart rate back to normal.

One too many drinks left you dizzy? Put your hand on something stable. The part of your ear responsible for balance — the cupula — floats in a fluid of the same density as blood. “As alcohol dilutes blood in the cupula, the cupula becomes less dense and rises,” says Dr. Schaffer. This confuses your brain. The tactile input from a stable object gives the brain a second opinion, and you feel more in balance. Because the nerves in the hand are so sensitive, this works better than the conventional foot-on-the-floor wisdom.