I respect everyone's opinion here, but I hve some questions on how some of the previous posts will directly help a golf swing get faster. But please don't take my questioning as insulting.
Dschultz--how does getting stronger and putting on bulk add to swing speed? If it did would all tour pros be drinking a gallon of milk a day a day and doing 20 set breathing squats trying to get has strong as possible like power lifters.
Instead you have guys like rickie who is quite small and bubba who looks like he has never worked out except swinging a golf club.
Also, Billy how does a stair stepper make you swing faster? I know you heard it from this tpi guy but I really just don't get it.
I think there is a lot in common with people who can swing the club fast with arm speed for a baseball pitcher. I'm not saying pitchers swing golf clubs faster, but that generaing velocity wether in golf or baseball is a strange thing that is not fully understood. It is kind of a mysterious ability definitely not directly coorelated to strength. (look at Tim Lincecum)
I think the way to train is how a baseball pitcher learns to throw faster. You have to adapt your body to swing faster. It is a slow progression, but eventually you should be able to maximize speed for your genetic potential.
Here is how I would program it:
1. You need some sort of swing speed monitor so that you have a mechanism of feedback and you know when you have swung fast and push youself.
2. Monday: I would do 8 sets of 3 practice swings on Monday swinging as fast possible (either practice swings or hitting balls, but just trying to get as high a speed number as possible, not worrying about contact or where the ball goes.). Keep track of fastest swing in each set
3. Tuesday: Recover. Eat well, sleep well. Maybe go to the driving range and hit irons or play a round, but realize you will have taxed your muscles and the goal is recovery.
4. Wednesday: repeat Monday
5. Thursday: repeat Tuesday recovery day
6. Friday: repeat Monday.
Hopefully you start to see some progress in terms of your speed increasing. If you begin to stall you can increase the volume of swings Monday. Do a light day Wednesday and then just do a s
5 sets of 2 Friday where you try to reach new speed heights.
This is the exact kind of thing I did. There's merit to the other stuff posted as well, but I can personally vouch for swinging a normal driver fast as you can in order to gain speed. The radar is invaluable as a tool to monitor progress. It doesn't have to be accurate, just consistent enough to track increases. It also allows you to experiment with different techniques to discover which one generates the most speed in your swing.