Karate and judo ( classical, not this new age girly shit!) been doing those for pretty much 30 yrs - will get you fit as fuck and keep you there, and they will keep you tough so you are more resilient and cope better with dumb stuff, got 25 years on some of the guys I hunt with and can still carry more weight over a longer distance and go up long nasty hills faster!. The real key to maintaining good condition is to never let it go in the first place, allways so much harder to get it back.
You would be suprised just how good skipping with a rope is for an overall workout, just 5 minutes a day will do at first.
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