Physical Exercise for Patients With Head and Neck Cancer

The goal of this trial within cohorts study is to determine and compare physical performance, muscle strength, fatigue, quality of life, body composition, nutritional status, physical activity, treatment tolerability of radiotherapy (RT), chemoradiation (CRT) or bioradiation (BRT), and healthcare related costs in patients with head and neck cancer (HNC) with and without a 10 week physical exercise intervention (PEI) during RT, CRT or BRT ((C/B)RT). Patients who were randomized in the PEI group and accepted the invitation to undergo the experimental intervention receive a PEI twice a week for 10 weeks. The PEI will be executed 6 to 7 weeks during and 3 to 4 weeks after (C/B)RT. Researchers will compare patients who undergo the PEI with patients who did not undergo the PEI to see if there is difference in physical performance, muscle strength, fatigue, Quality of Life, body composition,