letter to brother asking him to take part in games

Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:
 
- 'Healthy body houses a healthy mind'
- sports and games makes one physically fit and mentally alert
- inculcate healthy competitive spirit, sportsmanship and leadership qualities
- teaches team work, cooperation and gives a positive goal
- rejuvenates and freshens the mind to get back to study
- lack of exercise causes obesity, lifestyle diseases
- 'All work and no play makes Jack a dull boy'