He started with a jog, slowly warming up his muscles. While it started out a little painful, after around 10 minutes they started to ease into a rhythm.
Soon enough, Ken increased the pace as per Mika's instructions. Before he knew it, he was already running with 80% of his max speed through the residential streets of Tokyo.
Since he had already stayed at Ai's apartment a few times, he had no real worry of getting lost so he could focus on ensuring his heart rate reached the required speed.
Over an hour later, he slowed to a walk and began to get his breathing under control. He went to a nearby park and began to stretch out his muscles, his usual routine.
His mind wandered as he went through the motions. This was the first time that he'd trained alone in quite a long time. Usually Steve would be close by, speaking nonsense while he tried to focus.
Part of him missed the companionship, but another part of him enjoyed the serenity.