These things can lead to people feeling those certain feelings
Depression
Anxiety
Stress
Not enough nutrients
Sleep deprived
A. he can focus on progression, increasing the intensity and time he spends on the paddleboard.
c. he can start to lift weights and run a few days a week to add specificity to his training.
C is the answer. I am sorry it might have changed from when I have done this. I have done stuff with answers like these