Discussion: Cardio

For super low impact there is also deep water pool running. Maybe boring but you can get some waterproof earbuds or do intervals for entertainment.

If you lap swim and have pool access, crawl is a good way to get your HR up. Ideally something along the line of 4-8x 200-400m at about 80% effort with limited rest in between (5-15s) should do the trick, with maybe a minute between sets? I actually have a flip book with mix-and-match triathlon workouts somewhere that I would recommend if that's of interest. Just watch the toe push if you flip turns - sometimes that would tweak my PF.

what about boxing? become a pro-fighter hehe

Thanks. I'd kinda forgotten about the aqua jogging, but I think that's a 2nd reason to figure out the Cabrini pool again...

I swear by deep water running.
Well ... at least it keeps me doing something while injured. (As I recall, one year before a Scottish 6-Day I couldn't run at all, but was doing a lot of aqua jogging, and once in Scotland I was able to run all the races, at a decent speed, with no pain. YMMV.)