best 5 lifts for legs?

[stevesmi]

i wasn't aware you were in some sport where you were doing sprints. i would suggest working out the legs after the sprints

 

[MuscleG1]

Squats, Deadlifts(different vars.), and leg press would be my top 3. Throw in some calf raises and split lunges and your set!

 

[SuperStrong]

Barbell Squats (not smith machine!)
Hack Squats (I love this, really isolates thighs especially develops outer thighs for width)
Stiff legged deadlifts (if done right - excellent for hams and glutes)
Then I finish off with Leg ham curls and Leg raises.

Key is to keep progressing in weight. You can lift more than you think... a lighter weight will trick you into thinking that that's the weight because you will fatigue and burn out (but that's not failure that's just the burn) and that is still a light weight -- try for more next time, and you'll see you can lift more. Also learn and keep proper form always.