Foks I can only re commed hiking as a cardio, it's awesome to burn some calories, you are seeing something it's a lot of fun and you get out of the city or what ever shithole you're living in.
I'm into Bushcrafting tracking and all that good stuff since I did my specialisation 3 month after basic in the army, thats when the only good Officer I meet in the army actually made the training look interesting by going through all the different aspects of living comfortable in a non urban environment.
Who else here is into hill walking or hiking?