text: how can i improve my health? hi , i am a 5`8`` tall guy.my health is not so good .can i do exercise to improve my health? you should consult your doctor before beginning any vigorous exercise program, especially if you are very out of shape.  but you can begin with light exercise such as walking.  just make sure to start with a walk for about 15 minutes, and then rest.  if you can't catch your breath after a minute, then you need to slow down.  note that this is assuming you do not have any knee, hip, or back problems.