I combine weights and cardio daily, even if most can't keep it up. On a run of 111 days now. Heavy lifting for 21 sets and then an hour or sometimes two of cardio. Really depends on what works for you long term.
Trying to decide the best spot for cardio while lifting often. Normally see rest days as total rest, yet light cardio might aid recovery without harm. What's preferred: cardio after weights, on different days, or full rest days?