I branched off @DrFritzS's post and have some advice. I did some (kick)boxing in my 20s and I've been a general martial arts enthusiast my whole life. I have a heavy bag in my basement (currently gathering dust but I'd like to get some use out of it). Here's what I can advise.
1. Warm-up your joints
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Your workout should have a warm-up anyway but if you're in your late 40s, you might need longer to get the joints well lubricated. See #2
