“The Core Engine is real, and it turned out to be a huge untapped source of power for me. Knowing how to train it, and use it properly has been a game changer for my running, cycling, and nordic skiing.
I have no doubt my Core Engine is what powered me onto the 2019 Birkie podium after a 7 year draught, very little training, and just 2 days after getting rear-ended by a snowplow and suffering a nasty concussion.”
~Matt Liebsch, World Cup Skier, Birkebiener Winner