The Big Book of Endurance Training and Racing storage Non-slip and non-marking outsole

Non-slip and non-marking outsole

Round neckline and printed with the Fjällräven logo on the front

Deep heel cup works with your body's natural cushioning for maximum support

loaded with well-designed features

The Big Book of Endurance Training and Racing storage Non-slip and non-marking outsoleAre you a triathlete, runner, cyclist, swimmer, cross country skier, or other athlete seeking greater endurance? The Big Book of Endurance Training and Racing teaches athletes how to stay healthy, achieve optimal athletic potential, and be injury free for many productive years. Dr. Philip Maffetones approach to endurance offers a truly individualized outlook and unique system that emphasizes building a strong aerobic base for increased fat burning,