Go as far as you can in the following times
walk back to starting point and rest.
Round 1 = 8s (0:00)
Round 2 = 10s (2:30)
Round 3 = 12s (5:00)
Round 4 = 14s (7:30)
Round 5 = 16s (10:00)
Round 6 = 14s (12:30)
Round 7 = 12s (15:00)
Round 8 = 10s (17:30)