Ask Dr Nick: How can I avoid having to go to the toilet when I'm running?

Ask Dr Nick: Can you have your metabolism measured?

Ask Dr Nick: Do yoga and pilates count?

Ask Dr Nick: Is there an optimum amount of caffeine to consume when you're an athlete?

Dr Nick: What exercise guidelines can you give people who have have had knee replacements?

Ask Dr Nick: Given the ongoing debate, would you recommend cycle helmets?

Ask Dr Nick: How common is it for sportspeople to have eye surgery?

Ask Dr Nick: I think I have sports hernia. Will it heal with rest?

Ask Dr Nick: How soon after giving birth should women return to strenuous exercise? Is Paula Radcliffe a good example or an unattainable goal?

Ask Dr Nick: How long should you leave between eating and exercise?

Dr Nick Peirce: The risk of concussion, the most common form of traumatic brain injury, is certainly high in sports such as rugby. But there is little evidence that headgear reduces the incidence of concussion