Speaking of high-intensity fitness and hydration measures in workouts, you might be interested in learning more about High Intensity Interval Training here at the HIIT Wikipedia article. Besides, understanding the importance of hydration, not just during workouts but, in general, is often underestimated. You can delve into how to stay optimally hydrated on the Drinking Water Wikipedia article . Lastly, if you'd like to understand the science behind such workouts, you can explore the Exercise Physiology Wikipedia article.