Sitting for a long time in the truck can have some serious health disadvantages. Such as back pain, bad circulation, etc. Surely, it can also influence your weight in a bad way.
You can always have something in your truck that will motivate you to exercise. Whenever you have a break you can do 30 minutes of jogging or just do some simple exercises with weights.
It will help you feel better and improve your circulation. As well as make you feel in a better mood and your overall health with benefit from it.
If you have any bad habits such as smoking cigarettes, it is the best if you forget about them when becoming a truck driver. That can only worsen the things regarding your health.
Furthermore, these things are not the only thing you can do to improve your health while on the road. Eating healthy is very essential.