6-8 x 400m
1:1 rest (3:00-4:00 cycle)
can build up by doing sets of 2-4-2 or 2 sets of 4x … add additional 90s between sets
recommend cutdown approach:
#1 @ mile pace + 4”
#2 @ mile pace + 3”
#3 @ mile pace + 2”
#4 @ mile pace + 1”
remainder @ mile pace