Regular HIT without the intervals.
BODY BY SCIENCE (VIDEO 8): DEALING WITH SPECIAL NEEDS »
Water aerobics. If necessary in the deep end with a belt. It's not just for fat old ladies.
Ancestral Health Info
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Sledgehammer smashes. I did 2 Tabata intervals of those this past weekend and it had me gasping for air. They're good for avoiding high impact on the legs, since you're standing in place.