An exercise machine could mimic climbing
Treadmills could be easy to store
Pilates could be reformed / use machines
Kangaroo jumping could be exercise
Dogs could have treadmills
Roller coasters could be pedal-powered
Biking could be on roller coasters
Dementia / alzheimer patients could "bike" around familiar neighborhoods
Swim tethers / harnesses / cords could enable training in small pools
Exercise could be done with paper plates
A chair could be knelt on to improve posture
Necks could be strengthened
Jaw exercise could be harmful
Exercise could use trampolines
Exercise machines could have compression and cooling
