We have not tested this product ourselves; this page summarises the maker's published specifications.
The F4 tempo and flexibility golf swing trainer is a golf training aid that the maker describes as helping you feel your swing in rhythm while maintaining balance. It is a rubber ball attached to the end of a large, flexible golf shaft with a grip at the end.
It is listed at 1.65 lbs and 47 inches long.
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ProActive Sports F4 Tempo & Flexibility Golf Swing Trainer Features
Balance and Tempo
The maker describes the F4 as encouraging the arms and body to work together, so a more natural rhythm develops. This is intended to help develop a balanced swing with an efficient motion.
Coordination
The F4 is designed to synchronize the arms and body by requiring them to work together.
Flexibility
The weight on the end of the F4 provides a low-impact stretch when swinging, which makes it usable as a pre-round warm-up.
Strength
The maker describes a light core and wrist workout when used regularly.
Weighted Design
Weighted trainers like this are generally described as encouraging a swing on plane, and as allowing a full swing.
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Who Is This Golf Training Aid For?
The F4 is designed for golfers who want a warm-up tool when there is limited time to hit the range or stretch, such as before a short after-work round. It may also suit golfers who want to keep the feel of their swing during the off season.
Read more golf blogs such as, how to make a golf yardage book.