Starting last Nov, and fairly disciplined about getting in at least 1 run in a week, often 3 times, and this is on a treadmill at the gym. My duration is about 50 minutes, 40 min run time. This is instead of spin class.
I am somewhat shocked how much better I can climb hills. For the first time I am experiencing getting on top of the gear and accelerating while climbing, moving up gears while spinning up, more mph at the top of the hill than the bottom. Wow. Instead of cresting the hill feeling spent the feeling is more like blasting over the top. This must be what it feels like to be a 20 something rider... or my spouse is mixing steroid powder into my french press grind.
Can't wait for the MTB trails to dry out. Two big thumbs up for Mr. Treadmill; thought I'd mention it for those nearing the sixth decade.