Good question. I do easy-ish cardio workouts (like Cardio Party or Step Sync - just not something like Tabatacise or CrossFire), and something like a Cathe Live Fit Tower workout or Travel Fit or Boss Bands Total Body. I don’t lift anything heavier than 5 lbs during a recovery week so I stay away from traditional strength training workouts those weeks. I also do mobility or yoga instead of strength. A typical week is usually cardio Tues, Thu, Sat, and then a non-weighted strength workout or a stretching/mobility workout Mon, Wed, and full rest day Sunday.
Also, I try to fit in the recovery workouts whenever I can. Since a lot of the STS 2.0 workouts are close to 60 minutes, I will sometimes add one of the recovery workouts on my cardio days instead. If the cardio is 40 minutes then that leaves me 20 minutes for a recovery workout. I tend to try to not workout too much longer than 60 minutes. Some days I go a bit over that, but generally not.