4.3
W
D
ORKOUT
S
I
PEED
NTERVAL
This program alternates intervals of high and low speeds. As the profile diagram indicates, the speed gradually increases
in the early stage. The main section of the workout consists of high- and low-speed intervals. The contrast between
speeds is sharper than in the AEROBIC workout. In the final stage, the speed gradually declines.
A
EROBIC
This program alternates intervals of high and low speeds. As the profile diagram indicates, the speed gradually increases
in the early stage. The main section of the workout consists of high- and low-speed intervals. The contrast between
speeds is more subtle than in the SPEED INTERVAL workout. In the final stage, the speed gradually declines.
W
L
EIGHT
OSS
This program alternates intervals of high and low elevations. Unlike the HILL CLIMB workout, the high intervals are
uniform in elevation, as are the low intervals.
18
ESCRIPTIONS