a McFIT “Cyberobics” class: David Kirsch’s “Plank Workout” johayek 8 years ago https://www.mcfit.com/de/kurse-details-de/details/1630.html https://DavidKirschWellness.com https://DavidKirschWellness.com/about-david/blog/ https://twitter.com/DavidKirsch Share this: