What's everybody do for uphill work when there is no uphill near? Stairs and step ups seem to be popular but these are mundane and the stairs seem to be limited by how far you can go before turning around; step ups just don't give me the feeling of a hard pull uphill. Quadzilla and leg blasters seem more focused on eccentric (downhill) work. I haven't seen biking (maybe an assault bike?) or sled work recommended much, but it seems that these would be great for uphill work since it puts you more or less in a constant state of concentric work like hiking uphill.