If you are really worried about this, read this article. (http://www.stumptuous.com/this-just-in-high-rep-low-weight-toning-is-crap) But the short answer is no, lifting weights will not bulk you up. In fact, it will help you burn more calories and look better naked.
3 rounds of: 10 strict pullups-20 thrusters (95/65lb)
Run 800m together
3 rounds of 20 kipping toes to bar-20 burpees
Run 600m together
3 rounds of: 20 hang power cleans-20 hand release pushups
Run 400m together
*Split up reps as desired. One person works at a time,except on runs.