Answer:
False
Explanation:
You can't control the heart muscle or its cells: they respond to the things our body needs, such as oxygen in our leg muscles as we move, or getting rid of our waste carbon dioxide by breathing out. 
 
        
                    
             
        
        
        
The correct answer should be gymnastics. While the other mentioned sports could help him too, gymnastics is the most comprehensive one because it involves almost every muscle in the body to do various exercises, whereas biking would increase his leg muscle fitness most, but would not do much for the rest of his body.
        
             
        
        
        
1. Proteins
2. Body composition 
3.Flexibility
4. Weight management 
5.Carbohydrated
        
                    
             
        
        
        
Your answer of your question is, 
Explanation:
Environment