#Core this morning after my swim. Wall sits, back extensions, side planks, and leg lifts today. Strength is the backbone of solid endurance training. #triathlon #ultrarunning #ironman #usatrichamps #ultrarunning #utmb #utmbmontblanc pic.twitter.com/u26GXhfjxc
— Coach Iron Pete Triathlon Endurance (@ironpete_ultra) March 20, 2019
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