Nearly finished with the video, but no sound 'cause I couldn't find suitable voices that fit with the scene.
I feel I won't be able to make any more progress right now so I'm uploading the vid for now, but maybe I'll update it sometime in the future...

some motions used:
とれーにんぐもーしょん.AH (pushups, situps, squats): https://bowlroll.net/file/31268
【MMD】ファイト一発!椛ちゃん (treadmill run): https://www.nicovideo.jp/watch/sm17581975