No other training aid provides more benefits, simply by swinging. The F4 Tempo & Flexibility Trainer, naturally increases your flexibility, while improving tempo and timing. It also helps eliminate casting and over-the-top swings, which plague higher handicap golfers. Produces a Consistent Swing Tempo Provides Instant Feedback Improves Flexibility for Greater Distance Promotes Lag and Improved Timing Great for Warm-Up and the Range