I hurt my lower back about 18 months ago, picking something up awkwardly. I had physio and even saw a chiropractor. Apparently, I have damaged a disc. I can manage it quite well and can run without any reaction on soft ground. The ground is firming up now and I'm beginning to notice a difference the day after a game. Can anybody recommend any cardio I could do that would have minimal impact on my lower back? Is there any I can definitely rule out? Treadmills do my head in (although I always liked road running), so I'd prefer to avoid that.