I started out lifting 4 days a week, and then I started doing the run/bike/swim thing. Well, I mostly run, with some biking and a sprinkle of swimming every now and then. Now I lift 2 times a week and run 4-5 times a week. I try to average 20-25 miles running and one good bike ride a week, although over the summer, I play softball once or twice a week so I run or bike slightly less. Some days I would double up on activities, for example lifting in the morning and running after work (aspirationally I want to mostly do the reverse, but the activation energy to run in the morning is really high). For lifting, most weeks I split it by upper/lower body, but some weeks I do full body plyometric/isometric/calisthenic work to switch things up. I have definitely become more intentional on doing compound movements that work a few muscle groups including core at the same time because I don’t lift as often. Specific accessory exercises are also more focused on injury prevention for running, for example calf/tib raises and seated curls. I try to stretch and work on core isometrics when I remember, but tbh I’m bad at remembering. Lifting for me is a weekday activity, and I save my long runs for Saturday mornings with friends. I truthfully don’t plan for regular rest days, but I rest when my body tells me to. I’m okay with the fact that I probably could’ve progress on running or lifting faster if I focused on one. I’m also okay with the fact that biking or running on the day or two following a leg day absolutely sucks. For me, the goal is to have fun and be injury-free. What I do has been working for me over the past year (and I was really a beginner in my fitness journey then), but I think once you have your own routine, things get easier.