It is not recommended to exercise or go to the sauna after the laser treatment. The laser treatment has caused heat to enter the skin. The skin needs time to get rid of this heat. By exercising, going to the sauna, taking a (steam) bath or even taking a (long) hot shower, the blood flow is stimulated, so that even more heat enters the skin. This can cause too much heat to enter the skin and cause the skin to react to this.