Home > Fitness > Sport > Running 11 December 2012 The complete guide to interval training Introduce some interval training: workouts where you alternate high-exertion exercise with periods of rest. This Guide to Interval Training walks you through the main types. 0 take a Flexibility test » Receive Health tips » Ask Fitness Expert » Join Health24 on Facebook » by voltiercreative. Browse more infographics. NEXT ON HEALTH24X Can exercise offset damaging effects of alcohol? 2016-09-12 14:33 More: SportRunning advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... From our sponsors How to care for your vaginal flora Live healthier Hello? » SEE: Interesting facts about hearing loss Earworms: Let it go Is it bad to sleep with earplugs all the time? SEE: Do women hear better than men? The reason why men often appear not to be listening could be because they actually can't hear you. Confident smile? » Acidic drinks can harm your kids' smiles The facts on bleaching your teeth Am I taking good care of my teeth? Why are my teeth stained? We know the rules – brush your teeth twice a day and floss to keep them healthy. But, have you ever wondered what causes those stains that sometimes appear?