Iron Core Training Isometric Pushup Hold On Knuckles Wearing A 40 LB Weight Vest 3 Minutes

Johnny Grube doing a pushup plank on his knuckles wearing a 40 lb weight vest, this is a full body isometric and will toughen the entire body up and make the body very sturdy.

This was only 3 minutes and about 2 minutes in the body started shaking.

Give something like this a try.

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