Footwork is definitely key ...

Footwork is definitely key for a linebacker. We make our money playing laterally. You've got to be able to move side to side and play sideline to sideline. So doing quick feet drills like ladders and keeping your footwork right is important.
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 Brandon Spikes

Quotes from the same author

You want to have strong legs. You're in the trenches going against bigger guys in there, and you want to be able to have some force against them.
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 Brandon Spikes
Young guys should focus on maintaining their football position. Coaches always say the lowest guy wins. I'm a taller guy and a bigger guy, but because I'm always in a great football position is why I think I'm able to get away from guys still. It gives me a chance to recover.
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 Brandon Spikes
I'm doing a lot more cardio now. I want to be able to run and run and run and not get tired, you know, be able to play at a high level for all four quarters. I like to bike a lot and do some 300s here and there. Really, I love to bike though. I like being outside and moving around, seeing the good scenery around Miami and such.
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 Brandon Spikes