These machines were really made for incline walking more than anything else.

Take a look at the video tutorials - you'll take about
1 hour to master all the bells and whistles of the interface.

It makes no difference to the performance, the principle
being that the color of the lens blocks greens and browns, which are
the most common foliage and rough colors, and sharpens the color of the ball against the now dull
background, making it much easier to spot.