Our Sponsors: AmSport

As a MtB reader you can benefit from a 19% discount on all products on the AmSport website – simply use the code MTBAthlete


Mastering the Box is proud to be sponsored by AmSport UK.

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AmSport  supplements are “made by athletes, for athletes” (as their tagline states) and support many UK CrossFitters and the Masters community in particular.

AmSport’s founder, Mark Warnecke, understands the needs of older athletes, having been one himself. At 35 years old he shocked the swimming world in 2005 by winning the 50m breaststroke at the World Championships with a time of 27.63. He became the oldest swimming champion in history and was voted Sports Personality of the Year by his fellow athletes.

We use AmSport’s products and did so before they sponsored Mastering the Box.