Up, up, down is fun. I think.
When I was working for an eventer in Maryland and we had "workout days" double posted trot was our break. The rest of the time it was two point without hands, rider's push ups, two point with one stirrup (much harder than two-point without stirrups!), and other fun, muscle soreness inducing things.
"Always be yourself. Unless you can be a unicorn. Then, always be a unicorn."