Did sprints first time as a workout rather than just an odd sprint here or there. Its actually quiet tiring. For whatever reason i feel it a bit in my biceps too, like a small body pump.
I think i did like 5-6 sprints till 90% exhaustion. Lungs and throat were burning, my cardio is pretty shit, especially since i started smoking this year!
Was seeing stars too by the end of last sprint and had bit of a headache at the end! Anyone know what dis suggests other than shit cardio haha.