I'm still learning, but I think the only "free" ones where you can go as long as you want or set some time is walking, biking, and step. You can also set up some workouts in the locker room.
I just wear my heart rate monitor and bop around. Last night I did 3 parades, 18 min of bike, then one kung fu and that got me to 30 min.
A.
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