This is a Tabata-style high-intensity interval training (HIIT), so it's 40 seconds of work followed by 20 seconds of rest. Source: london_fitness_guy https://www.instagram.com/p/DKwlRoeo-O5/
In memory of Navy Lieutenant Michael Murphy, 29, of Patchogue, N.Y., who was killed in Afghanistan June 28th, 2005. This is the unpartitioned version, and …