No bike, I'll run then

Running to supplement cycling, while I'm doing family Xmas duties, I've been doing a morning run, in the rain. Concentrating on good aerobic workouts in short amount of time(40mins). Doing hill intervals. I feel like I've done a good club run on the bike when I return, except running is high impact and using your leg muscles in a different way to cycling. As you're running your muscles are lengthening (eccentric contraction) and opposite is true of cycling (centric contraction). Left me walking down the stairs like a crab. But I'm hoping the aerobic workout will be of benefit as well as burning Xmas calories.