A 2011 study published in Proceedings of the National Academy of Sciences found that older people who reported being the least happy died at nearly twice the rate in the next five years as people who reported being the most happy. Even after adjusting for factors like illness, finances and depression, people who were the happiest still had a 35% lower risk of death.
Happiness plays one of the greatest roles in improving the quality and quantity of your life. What about exercise? Exercise must also make you happy, even though it may seem strenuous or tiresome, you must enjoy the pain. However, if your exercise schedule becomes your topmost priority, your joy in doing it becomes less, making it more of a draining chore. Training must be a part of a balanced schedule, helping you savour the training for later, so you are able to really enjoy a hard session.
As well as balancing your training schedule with other things that you possibly enjoy, you must give more time to God, encountering His Spirit, which brings everlasting joy. This is said in John 15:11
I have told you this so that my joy may be in you and that your joy may be complete.