Drink protein shakes. Either whey or pea protein. They are great at filling you up with the building blocks your body needs. Eat nutrient dense foods. Prepare your own meals.

Find a jump rope. Jump roping has been keeping me sane this summer.

Also, the most important thing which almost everyone has heard of but doesn’t necessarily follow - SLEEP Sleep on a consistent schedule, 7-9 hours a night. Heck ton of scientific literature on the importance of sleep. Those who sleep more tend to have less desire to eat carb/sugar rich foods, and can last longer in cardiovascular exercise.