Air Travel: Squeeze in some in-flight fitness

Isometric tightening of your muscles is the simplest way to exercise during a flight. Focus on a muscle or group of muscles—say, your stomach. Sit up straight, and take a deep breath. As you exhale, tighten your muscles and hold for a count of 10. Release and breathe in. Repeat five to 10 times. Do this every 20 minutes or so, choosing a different muscle or set of muscles each time.

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