Herschel Walker Still Does 3,500 Sit-Ups Daily, Offers to Train Trump!

Herschel Walker is 56 years old … and he’s still in INSANE shape — telling TMZ Sports his daily routine includes 1,500 push-ups and 3,500 sit-ups.  THAT’S NOT A MISTAKE — HE REALLY DOES THAT!  The ex-NFL star was leaving the White…

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