Chiming in to say take caution when exercising to learn good technique. One life lesson I have learned is that a few guided lessons from a professional is money and time well spent. Poorly executed push ups account for many a shoulder injury and failing to stretch is always a fail.
My older body won’t take the routine it once could so for me it’s cycling with a fast(ish) pace for distance, recently added kayaking to work my upper body and core, then reps with dumbbells in conjunction with tv watching. Every commercial, bathroom break, etc. gives you 1 minute to keep toned. I also chose to lighten up on the weights in favor of higher reps so 40 lb bells are what I limit my lazy man routine to.
Sounds pretty pedestrian but it’s easy enough and believe it or not, I had 50 other kayakers (that is to say all of them) of various description chasing me down river last event despite fancy equipment, youth, and in some cases much better physiques. Just a whisper behind me out of the locks was a woman 10 years my senior Another example of technique overcoming pure physical advantage.