For someone who is trying to return to regular walking/running, I find a mix of both works well for me. Stretch and start walking faster to warm your body up, run until your heart/legs don't want to go anymore, resume walking to recover and then run again and so on. I find that doing this creates less resistance in my mind because I'm more attentive/easy going with my body and the overall session is less punishing - that makes going for that next session psychologically that much more easier, which is the key to maintaining a regular schedule, atleast for people like me who do not "love" exercising.<p>PS: also, I bought a smartwatch that shows the stats etc which is kind of a fun target to meet/improve upon - not sure if this "gamification" is a good idea or how long until the novelty wears off but its fun for now.