Just for comparison, they list the following activities as well:

Backpacking with 10 lb. load 180
Backpacking with 30 lb. load 235
Gardening, (heavy) 155
Gardening, Moderate 90
Hiking with 30 lb load 235
Hiking with a 10 lb. load 180
Hiking, (no load) 155
Shopping for groceries 60
Housework 90

Maybe it's just my own bias, but I'd like to think that cycling is more than a few steps a minute more intense than "heavy gardening."