The phrase "marathon workouts" refers to exercises or training sessions that are very long and intense, similar to the endurance required for a marathon race. Full definition
As a skinny kid I thought marathon workouts were the answer to building muscle mass, but all it did was tire me out and become a social event. (fitnessdoctrine.com)
That's where key marathon workouts and training program adjustments can help you crush your BQ goal. (runyourbq.com)
The truth about marathon workouts and why you MUST dramatically shorten your training sessions for the fastest fat loss results (omegabodyblueprint.com)