The purpose of this study was to determine which of 13 weighted batting warm-up implements would produce the greatest bat velocity in subsequent trials. Sixty male high school varsity baseball players participated in a standardized warm up with one of 13 weighted implements on separate days. Bat swing velocity was determined using a photosensing computer-timer immediately after warm up. Warm up with an implement that was weighted within approximately ±10 percent of the standard 30 oz. bat weight produced the greatest bat velocity, P < 0.05. Mean bat velocities ranged from 24.5 to 27.1 m • s−1. It was also noted that there was a trend of decreasing velocity following warm up the more the weight of the bat deviated from the standard weight bat. Additionally, the commonly used donut ring consistently resulted in the lowest bat velocity. It was concluded that to achieve the greatest bat velocity, warm up should be performed with a bat near the standard weight.