Editor's note: Adam Rees is Founder of GRIT GYM, a gym based on results, creating a culture and lifestyle of performance, strength, health and freedom. This is the last of a two-part series on cardio ...
As many of us know, fartlek literally means “speed play”. This mode of training is not only used nationwide, but it’s also a worldwide phenomenon. In a previous article in Athletics Weekly (December 6 ...
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