These bars allow you to really get up on top of the pedals and grind out low cadence standing power for climbing in hard gears which is why the bar is so popular with single speeders. Your hands pull more towards your shoulders, a more natural ‘pull’ with stronger muscles. This allows you to push down with more force at the pedal. In extremely tight turns with the bar close to 90 degrees your outside arm and wrist is not taken to the edge of their flexible range as with traditional bars. This provides more control and stability on switch backs.
The sweep matches your natural hand and wrist positions creating a stronger hand and body position. With an H-Bar, your weight is evenly distributed across the width of your hand instead of being focused at the out side edge of your hand, the main cause of finger numbness. This ‘even grip pressure’ on the bar allows a better, more secure grip on the bar.