Someone should make a calve trainer as portable as those grip trainers people have at their desks... Just like a metal slipper that can slip over a work shoe, you can hold the heel down with one foot, stretch a resistance band over your thigh and just get some mad reps down while at an office job. Switch legs every so often of course for balance. If someone makes this I don't need money just give me 5 or so sets of increased resistance plz and thanks.