Question:
Is it Mutar to exercise to music during sefiras haomer with music?
Answer:
Music that is played in order to help you do your exersice is not considered music for happiness and permitted to listen to while you are exercising.
Best wishes
Sources:
Meiri – Sotah 48b, M:B 560-13, Kovetz Halachos (Sefiras Haomer) 9-13 ftnt. 14.