I did septoplasty and tubinate reduction last week can I use a hypertonice nasal saline or only isotonic. Can I perform swimming and exercices (sports)?

Ask your surgeon. The surgeon who did your procedure would be the best person to ask about post op care.
Sinus Surgery. What did your surgeon tell you? Usually they want a period of 2 weeks for optimal healing. Isotonic saline is recommended at first to prevent irritation.