Thanks for your input rachelp!
Great idea, I will give a try to downhill jogging!
On flats, when alternating walking and running, were you doing 30/30s (or other?) so the average rate was in the right zone?
Hiking would indeed be my best option. Unfortunately I do not have the chance to live in mountain country (Eastern Canada). The closest mountain in my area is a 2h30 drive which makes it difficult to use for daily work outs. The best hill I have nearby is a 200 ft elevation gain over a 2000 ft distance.
Thanks 🙂 !