The other night at dinner we asked our five year old the question of which came first, the chicken or the egg? She thought about it briefly and then answered confidently saying the egg. To which we then asked her where the egg came from? You can imagine the puzzled look on her face and could see the wheels turning in her head. She realized she it was going to be a hard question to answer. This can be similar to exercise with respect to whether you should do long, slow steady-state exercise or short, high intensity intervals. The last few years have seen a surge in HIIT i.e. high intensity interval training, Tabata and other intense training protocols. However during COVID we have also seen a number of endurance feats including Everesting, round the world cycling challenges and other long distance endurance challenges. So which one is it? Should we go hard and short or long and slow? Well a recent Canadian study looked to answer this question. Here's what they did. Twenty three adult, sedentary men were divided into two groups. One group did 30 second sprint intervals on the bike with two minutes rest. They repeated this four to six times and completed this workout three times per week. Over the course of the six study they completed almost one hour of cycling. The other group rode the bike five times per week for 30-40 minutes at around 60% of their peak power. By the completion of the study this group had logged 15 hours on the bike. Researchers wanted to know the impact these would have on fitness, body composition and blood pressure. What they found is that those performing the endurance workouts i.e. 30-40 minutes of cycling saw greater improvements in: diastolic blood pressureabdominal fatpostprandial lipid...