He's 52-years-old ... but NFL legend Herschel Walker tells TMZ Sports he still has an UNBELIEVABLE workout routine -- knocking out 1,500 push-ups every single day.
Walker was out in NYC on Tuesday looking jacked -- as usual -- when we asked how he manages to maintain his incredible physique.
For Herschel, he says the trick is easy ... just a simple 1,500 push ups plus THOUSANDS of sit-ups.
He's not joking -- check out the clip ... the guy is a beast.
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