How to pretend to not be lazy...

One of my goals while here (and in life) is to exercise pretty frequently and be in good (muscular and cardiovascular) shape. I went for a couple brief run/jogs earlier, but haven't since I've started biking to and from school, which is currently my primary cardio (~15 min, decent amount of uphill on the way there, 7-8 min mostly downhill on the way back). Besides that (and some random pullups on the doorframe) I've been doing the recommended core workout stolen from Clockwork (the Princeton Ultimate frisbee team, whose list I am still on (mostly for interest/entertainment) though I never found time to actually join the team). Ideally I'd do it 3-4 times per week, but I've probably done it 2-3. The most recent version that I've done the past 2-3 times is pasted below.

"This week stick with the ten miles of running. In the middle of each run do 7 minutes of up tempo running (about 75% of a sprint). [I haven't done this part.]

[This is the part I'm talking about.]
50 sec V-sit
12 push-ups
70 bicycle crunches
13 push-ups
15 supermans
14 push-ups
50 oblique crunches (25 on each side)
13 push-ups
3x50 sec plank (one regular plank, then one on each side)
12 push-ups

V-sit: lie on your back, raise your legs and your shoulders about 6
inches off the ground. Your shoulders should be high enough to reduce the strain in your lower back. Hold this position for the stated amount of time.

Bicycle crunches: You should be on your back in a normal crunch
position with your shoulders about 6 inches off the ground. Hold your
hands behind your head but don't strain your neck. Bring one knee in
towards your torso and touch it to the opposite elbow, while
simultaneously extending your other leg. Your shoulders should never
touch the ground. Each time you touch elbow to knee that is one rep.

Supermans: These are a little different than the way we did them last
year. Lie on your chest and have your arms extended in front of you.
Raise your arms and legs about 6 inches off the ground. Hold this
position for ten seconds then relax. That is one rep. You shouldn't
rest more than a second or two between reps.

Oblique Crunches: Lie on one side and have your legs bent for
stability. Hold your hands behind your head, again don't strain your
neck. Use your abs to lift your shoulders off the ground and try to
touch your elbow to your hip. That is one rep.

Plank: Hold yourself in a push-up like position, except our arms are
bent and both your forearms are touching the ground. Try to keep your
back straight. Hold this position for the stated amount of time. For
side planks, lie on your side and then raise yourself off the ground by supporting yourself with one forearm. Again, try to keep your body straight."