3    Walking the dog
3    Walking, 4km/h, firm surface
3    Walking, 4km/h, downhill
3.5 Walking, 4.8km/h, level, moderate pace, firm surface
3.8 Walking, 5.6km/h, level, brisk, firm surface, walking for exercise
5    Walking, 6.4km/h, level, firm surface, very brisk pace
6    Walking, 5.6km/h, uphill
6.3 Walking, 7.2km/h, level, firm surface, very, very brisk
8    Running, 8km/h
8    Jumping rope, slow
8    Walking, 8km/h
9    Running, 8.3km/h
10    Running, 9.6km/h
10    Jumping rope, moderate, general
11    Running, 10.7km/h
11.5 Running, 11.2km/h
12    Jumping rope, fast
12.5 Running, 12km/h
13.5 Running, 12.8km/h
14    Running, 13.8km/h
15    Running, 14.4km/h
15    Running up stairs
16    Running, 16km/h
18    Running, 17.4km/h

For a more comprehensive list, go here