"Let's get physical"

Sometimes The Guardian is just depressing (here):

"One big packet of Kettle crisps, (728 kcal per 150g)
To burn this off:
Run for 50 minutes
Walk for 2h 25m
Sit quietly for 8h 15m

KitKat (508kcal per four fingers)
Run for 37 minutes
Walk for 1h 40m
Sit quietly for 5h 45m

Sources: Calorie Counter, Collins Gem Fitnessonline.com
Times for a 10-stone person walking at 3mph or running at 7mph."

It is small consolation to know that these exercise options are alternatives rather than cumulative.