Oyo Nova Personal Gym for exercising at home, in the office, or take it with you when you travel. It uses their Spiraflex discs as resistance equal to 10 lbs, or 4.5 kg. You can stack them to have up to 40 lbs of resistance. This is an interesting and convenient workout device that has apparently been used by NASA to keeps astronauts fit in zero gravity. If you remove all the workout discs, it can fold up and store easily.
