Building Muscle without losing Speed

weight train specifically for power and strenght, this will actually make you quicker and you will add mass (good mass)

plyometrics
weight train 5 x 5 focusing on compound exercises
complex power training (very good and went into detail by puma in strenght thread)
ala jeffro log onto ross boxing some good stuff there for increasing mass without going down the bodybuilding route

 

Surely you can train with a deficit and still put on functional muscle whilst losing fat?

 

Good advice guys.