In this book, we focus on two important habits, getting enough quality sleep and exercising. Sleep is important for our health and wellbeing because it gives us the ability to rest and reset, providing the body with time to grow, strengthen the bodily systems, and heal from illnesses (78:9). It is also a means to disconnect from our daily stressors. As our Prophet (SAW) said, "Your body has a right over you," so it is our responsibility to take rest properly (source below).
The second lesson is about the importance of physical movement. Exercise not only strengthens and supports our physical bodies, but also our cognitive development. The better our bodies are, the easier it is to do everything else in life -- from thinking to worshipping to running.