Put Your Muscle Into It: Introducing XEM2, a Novel Approach for Monitoring Exertion in Stationary Physical Exercises Leveraging Muscle Work. - Jana Franceska Funke; Mario Sagawa; Georgious Nurcan-Georgiou; Naomi Sagawa; Dennis Dietz; Evgeny Stemasov; Enrico Rukzio; Teresa Hirzle (CoRR, 2026)