Ben Greenfield's 21-Minute Cardio Routine
5 Sept 2025 · 1 min

0:54
This is a short transcript excerpt from Ben Greenfield's YouTube video "Ben Greenfield's 21-Minute Cardio Routine." Ben endorses a training device he calls a "Waspa," describing it as a game-changer used by professional athletes because it is joint-friendly and enables intense V̇O2max-style sprint work without high injury risk. He reports completing eight 30-second sprints in one session and claims that, with the device plus added technologies (oxygen and red light), he can achieve in 21 minutes what he normally gets from a long cardio workout.
Questions this video answers
Eight 30-second sprints.
30 seconds per sprint.
21 minutes.










