A US Navy vet did walking lunges for more 4.06 miles — breaking two world records in the process.

Mike McCastle, 38, completed his knee-crippling feat of endurance across Utah’s Bonneville Salt Flats as part of a lifelong challenge to complete 12 extreme sporting missions.

He broke the world record for the most lunges in an hour — completing 3,262 — and the record for the longest distance traveled by walking lunges in the same time frame, covering 2.22miles. 5

And not content to just break two world records — he continued his walking lunges for as long as he could physically manage — a total of 20 hours and 39 minutes, finishing with 4,769 lunges over 4.06 miles.

He took breaks to use the bathroom, rest and eat — and because of lightning striking nearby.

The air traffic contr

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