This page contains affiliate links — if you buy through them I may earn a small commission at no extra cost to you. Everything below is based on my own first-hand use of the ProSENDR Widener.

The ProSENDR Widener is a big, rigid bit of kit: it straps to your lead forearm with the far end tucked under your trail armpit, and it is built to do one job — promote width. It is $199, and it comes from David Woods and Sean Foley, the same team behind the original ProSENDR wrist cradle.

I am someone who personally struggles with a lack of width. I get narrow, pull the hands in, and end up open. I used this aid a lot in the run-up to Open qualifying this year and it genuinely helped my ball striking. With the Widener on, my trail arm is forced to stay wider in the downswing, which shortens my swing up, and as a result I square the club face rather than leaving it open and steep.

I pair it with the ProSENDR Cradle (the wrist cradle). Using the two together really helps me shallow the club and square the face through impact — it takes me from open and steep to shallow and square. The bigger win for me is the follow-through: I tend to chicken-wing, especially with the driver, and that had been giving me real left-shoulder pain. Hitting balls with the Widener trained me to keep the width all the way into the finish. Honestly, it has probably paid for itself in physio visits.

As a coach I use it a lot with players who lose width. There is an interesting biomechanical effect too: because of the position it loads, it encourages more torso rotation — I have seen that show up as greater torso rotation in 3D data on players wearing it. It is also excellent for chipping and pitching, where most amateurs get narrow and collapse the arms. If you want to see the difference for yourself, film a before-and-after with the Handy Golf app — the change in club face is easy to spot.

A lot of "position" training aids fight you the moment you take them off. I do not find that with this one — you can really feel the move and it transfers. In the studio I will put it on a student for the feel, and when I want something that actively forces the position I will pair it with the GravityFit TPro (use code rosseves for 10% off). A few honest negatives: it is a big unit, so you will lose a touch of club speed with it on; it is pricey; it will not fit in a golf bag and sticks out, which is my biggest gripe when travelling; it can slip on the lead arm in cold weather or over a jumper; and it is a little fiddly to put on. But for what it is designed to do, it is one of the training aids I actually keep reaching for.