Power, Speed, ENDURANCE is a highly effective training system that has catapulted thousands of endurance athletes to the next level. Developed by CrossFit Endur

Authoritative yet accessible coverage of an area of growing importance.

RUN WITH POWER is the groundbreaking guide you need to tap the true potential of your running power meter. From 5K to ultramarathon, a power meter can make you

National Geographic Adventurer of the Year Jennifer Pharr Davis unlocks the secret to maximizing perseverance--on and off the trail Jennifer Pharr Davis, a reco

Hunter Allen and Andy Coggan, PhD have completely revised the book that made power meters understandable for amateur and professional cyclists and triathletes.