Both.
Here is a rotation I made up for S&H.
day 1: S&H chest and back
day 2: Imax 1
day 3: S&H bi/tri
day 4: KPC
day 5: Rhythmic Step
day 6: legs and shoulders
day 7: off/yoga
Repeat for a total of 3 weeks.
Here is another way to use S&H:
day 1: S&H chest/30-45 min cardio
day 2: S&H back/ 30-45 min cardio
day 3: S&H legs/yoga
day 4: S&H shoulders/ 30-45 min. cardio
day 5: S&H triceps/ 30-45 min cardio
day 6: S&H biceps/ 30-45 min. cardio
Repeat for 3 weeks
If you go to the rotations forum you will find other rotations using S&H.
Hope this helps.
Enjoy! I love S&H and its a great plateau buster!
Deanie