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Sure there are isometric exercises while on long trips with cruise control. First, grip the steering wheel very hard and push hard against it not letting your elbows bend, try 30 seconds at a time, three times. Push your back against the chairback while tightening your abdominals, 30 seconds, three times. Push your feet against the floorboards, one at a time, hard for 30 seconds, three times. Try to lift your bottom off the back bottom of the car seat with your thighs pushing down on the front of the seat, 30 seconds, three times. Find a hard place in the ceiling where there is a strut and push up against it with one hand, hard, 30 seconds, three times. Keep your other hand on the steering wheel. There are others you can do in the back seat, but not while driving. Enough?

George L. Dixon, Jr., M.D.