the short answer
The best small group training ideas use formats that scale across mixed levels: AMRAP and EMOM circuits, partner and team relays, a strength block paired with a shared conditioning finisher, and themed blocks built around one focus. Cap the group at 3 to 8 clients, build an easier and harder option into every movement, price per head below your 1:1 rate, and lock a fixed weekly time so the group becomes a habit.
This article is general programming and business guidance for coaches, not medical advice - screen clients appropriately and refer health questions to a qualified professional.