What will be much harder to achieve is the “Flow” type of workout, where the player smacks targets using bats, originally popularized by Beat Saber and perfected by Supernatural. This is due to the arm extensions required to maintain good form and avoid strain and injury, which naturally puts your hands in positions that take it outside of the cone of vision most cameras can track without controllers. If you decide to keep your player’s arm movements limited, you’ll be much more likely to have repetitive strain injuries from the short drumming motions.
Crunches, leg lifts, running in place, and jumping jacks are all quite doable with just the tracking of your body from the Apple headset, so either focusing on these or adding them to a primarily boxing app would be a relatively safe path forward.