So after lunging, hacking and arena work I have my horse pretty fit and ready to start polishing what she already knows and adding new things after an easy winter of riding. The problem is that I'm behind the fitness curve and she's ahead of it. I can ride for an hour in the arena or do a few hour trail ride and school some issues or "fresh" behaviors. But 15 minutes of intense dressage work or jumping and I'm breathing like a racehorse and need a long walk break before I can get back into it. I was wondering if anyone had any at-home or at-barn exercises to help re-build cardio, flexibility, muscle tone, etc. I know that mucking stalls and carrying buckets helps, and that riding also builds muscle and cardio but that's not cutting it for me. Apparently I need more of a boost than normal chores and daily activities are giving me to get back into "riding fit". Any suggestions? Hopefully some other poor out of shape rider can benefit from this as well.