Interval training

Set 1 (run : rest = 1:2)
400m 1"26
300m 1"02
200m 45
100m 17

(rest 2 mins)

Set 2 (run : rest = 1:2)
400m 1"32
300m 1"03
200m 40
100m 17

(rest 2 mins)

Set 3 (run : rest = 1:2)
400m 1"34
300m 1"07
200m 41
100m 18