That's right. A skull crusher is a triceps extension exercise. You lie on a flat bench and hold a weighted bar with a close grip extended above you (like you just completed a close grip bench press). Keeping your upper arms perpendicular to you and the bench, you flex you elbows and lower the bar towards your forehead (slowly!). Once the bar is about an inch from your forehead, you extend your elbows still keeping your upper arms perpendicular back to the extended position. It gives your triceps a good workout.

Anyway, Thursday:

-Slow jog 3/4 of a mile to where I have my intervals measured out along the road and where I can run on the gravel next to the road.
-Interval runs - 4 x 350m with a one minute rest between runs.
-Walk part of the 3/4 of a mile back and then slow jog the rest of the way as soon as I get my breathing somewhat normalized.
[Conditioning part 2]
Sprint 100m
Run Backwards 200m
Sprint 100m
Sprint another 100m
Jog 400m with hands up throwing punches
Sprint 100m
Run Backwards 100m
Jog 400m
Squat Jumps 6x
Split Jumps 10x
Tuck Jumps 6x
Side to Side Footwork drills (side shuffles) 4 x 2minute rounds with a one minute rest between
Made Breakfast and then went to work
When I got back from work, I did 4 x 2minute rounds of mitts with Trainer Monkey
4 x 2minute rounds of working the double end bag
I had to scratch sparring with Trainer Monkey since his back and shoulder were giving him grief today
Finished with stretches