Depending on how long the person remains inactive and how many pounds do they put on will determine the risk of developing the disease. Not exercising and gaining weight has been shown to lead to cardiovascular disease and later to heart problems. But that is not that alarming for people who are around their normal weight.
After he has adjusted to his exercise routine he should increase the intensity of the workout. Ex. add weight/ increase reps. This will help get his heart rate higher.
