Hydration
Maintaining enough water in the body
Endurance
The ability to continue physical activity for a long time (stamina)
To work out
To exercise
To stick to
To continue with a habit or exercise
To tone up
To increase muscle strength (but not extremely)
Well-being
Overall physical AND mental health
Maintaining balance
Making decisions that keep your overall health in a good state
To fight off
To resist an infection (her body is fighting off an infection)
Mindfulness
Paying attention to your physical and mental health (awareness)
To cut down on
To reduce the amount of something you eat
To wind down
To relax after a tough workout or long day
To fill up on
The get full from a food (you should fill up on healthy food instead of fried snacks)
Nutrition
The necessary vitamins and nutrients we get from our food
Immunity
Your body's ability to fight off infections (resistance)
To warm up
To stretch and prepare your body for a workout
Recovery
The body healing itself after intense exercise
Metabolism
The body's system to convert calories into energy