Am a big believer in having a double (or triple) set of exercise or workout "tools" on hand. Some call it "cross training"; when one group is worked out (eg: from weights in the gym) then water exercise or related. Mixing it up and avoiding repeating movements, will be the most sustainable. No question.
Also, old muscle injuries (in the form of myofacial adhesions) do not heal, they become "latent" and wait (in their damaged state) for something (or someone) to fix or repair them. What this means is, if you go out with sore leg muscles, and you use them hard, you will have to pay the piper later, as the buildup of damaged tissue will eventually shut you down.
Sitting and not doing anything, can create myofascial adhesions, also. These adhesions then put pressure on nerves in the legs. Stretch to prevent these. Sitting (especially bad) having mashed the glutes (and basically cut them off) making them "lazy", can put muscle/skeletal pressure on nerves in legs, giving someone sciatica from being inactive. (!)