New SKLZ Swing Accelerator Iron Golf Training Aid With Instruction Manual and Online Training. Description of Swing Accelerator Iron - Weighted Training Club, including online video. Hittable Weighted Club. Finally, a weighted club that gives you good feel instead of seeming like a heavy block in your hands? and you can hit balls with it. The patented internal weighting system provides true club balance and weighting. Increases distance ? longer straighter shots Increases strength & flexibility of golf-specific muscles Ideal for warmup or staying in shape during the off-season.