of running that contributes to overuse injuries, it also noted that cycling can cause its own set of problems, particularly back pain.By doing extra endurance work in low-impact or low-weight-bearing aerobic activities such as stair climbing, deep

. "Duathlons can be a good gauge of performance, and they can replace 'threshold' workouts with something more interesting" says PhysFarm Coach Dr Philip Skiba.Duathlon, which has national, European and world championship races, is governed by British Triathlon

Swim session"For beginners it's initially about working towards being able to cover race distance. So if you are limited to an hour you have to make sure you use that time efficiently," says Paula Dewar, coach at VO2 Maximum Triathlon Coaching. "With swimming