There are reasons for and against using caffeine before a workout.

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Using caffeine before a workout can make you:

1. Release fatty acids into your blood stream, helping your body in endurance activities.
2. More Energetic so you work harder during your workout.
3. More focused and concentrated for your workout.
4. Have a bawl movement so you don’t have to go to the bathroom during your workout.

Drawbacks include:

1. Dehydration.
2. Less blood flow back to the heart impairing performance in anaerobic activities,
3. Being jittery or shaking if you aren’t use to caffeine.

Overall, you should give it a try.  Some peoples workouts are positively affected by caffeine.  Others have weaker workouts.  Test whether caffeine before a workout works for you!