Do you like the idea of riding horses? Do you want to get fit? If so, check out "Horse Riding Fitness Ace Power!," a portable, flexible A-frame on wheels with a seat to allow the operator to sit on it like a horse—then perform squats, thrusts and pelvic oscillations, to whatever ends or purposes the operator intends.
The video is fairly old, but I prepared three sterling GIFs from it for you to enjoy afresh.