Participants in this group will be referred to a prehabilitation prescription protocol of nutritional counseling and exercise for HNC patients. Participants will attend for nutritional counseling and exercise sessions for the duration of their radiation therapy (RT) or chemoradiation therapy (CRT) for HNC. The duration of these sessions depends on the participant's treatment plan and the timing of enrollment.

Participants will also have three in-person assessments during the study period during the following timepoints (T), to assess feasibility and acceptability of the prehabilitation prescription protocol: Baseline (T1), at the completion of RT/CRT (T2), and 8 weeks after the completion of RT/CRT and the exit survey (T3).

Total participation duration is up to 18 weeks.

Participants will be referred by their healthcare provider to an oncology nutritional counseling and exercise program administered standard of care by the Cancer Support Service at the Sylvester Comprehensive Cancer Center. Participants will be scheduled to the predetermined frequency and length of visits with oncology dietitians and exercise physiologists per the prehabilitation prescription protocol developed during the pre-implementation period.

Feasibility will be measured as the percentage of participants that agree to participate in the prehabilitation prescription protocol. Criterion for success: At least (≥) 50% of all eligible participants agree to participate in the prehabilitation prescription protocol.

Feasibility will be measured as the percentage of participants attending scheduled visits of the prehabilitation prescription protocol. Criterion for success: At least (≥) 70% of participants attend all scheduled visits.

Acceptability will be measured as the percentage of participants that report satisfaction with the prehabilitation prescription protocol. Criterion for success: At least (≥) 80% of participants complete the prehabilitation prescription protocol.