Add something fun to the workout, during or after. I myself am a member of a sports team of my school. A few examples of things I look forward to are of course staying in shape, the road trips to meets, and being able to eat a lot whether it be junk food or healthy food. This student should look at the positives of physical fitness.
Actually, it's more like losing water weight. Tell them it's unhealthy and it might not be good for the body even though it sounds promising. The diet can be unbalanced and actually unhealthy. Hopefully this helps
