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Dr Leow suggested 5 to 10km of jogging. If you want to monitor your hearbeat, then buy a sports watch or a chest strap

Avoid HIIT completely.

I believe any jumping acts in an aerobic class is higher risk.

Prof Lee of NUS .. death after a run
Sim Wong Hoo .. ultramarathon runner
A: too much running can be dangerous to some people. Marathon runners may not have low risk of heart failure. The only way to assess heart risk is a medical test.