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FARTLEK is a form of conditioning which puts stress on the whole aerobic energy system due to the continuous nature of the exercise. Now you can explain to your non running companions what this means so they can wear the t-shirt and continue the cycle.
** Items listed in the 'Clearance Store' section of the Running Room Shop are already at a clearance price. The sale of this product cannot be combined with any other promotional offer, coupon or discount.