It depends—how many tomatoes can you take to the ribs before suffering internal bleeding?
There are no dangers that are directly related to the job itself, unless you're especially clumsy and tend to fall head-first off the front of the stage. Most of the physical dangers are a by-product of the lifestyle—spiraling into a deep depression that leads to substance abuse, etc.
But otherwise, you'll be safe. It’s amazing how much work accidents decrease when your workday is only 15 minutes long.