flatter than other jumps, and tend to be situated on downhills, so the slope of the hill can serve as a landing. They're used mostly in competitions on jump length. Rollers are small tabletops that give you extra speed by 'pumping' the jump. They are usually found at the beginning of a trail. Step ups are ramps just before inclines. They enable riders to jump from the top of the incline to a raised landing. Whoops/Rhythms a series of three or more small rounded ramps close together, enabling riders to 'manual' over them. Spine is a steep dirt jump with a take-off and a landing, but no table or gap, made to get higher air without distance. Berm a curved embankment that comes out of the ground. Mostly used on sharp turns, berms assist riders by giving them the ability to bank sharply, and make a sharper turn. Mainly used on downhill trails, but can also be present alongside dirt jumps to help riders avoid hitting trees. They are also used to maintain riders' speed without having to brake on turns. Some trails consist of jumps that lead into berms. Hip Jumps consist of a jump with the landing 45 - 90 degrees left or right of the ramp, enabling transfers. Triple Jumps consist of a take off, unused earthwork and a landing 360 Berms consist of a large berm that goes just shy of 360 degrees, and is either jumped into and/or out of. Types of Acrobatics See also Cycling BMX bike Freestyle BMX Single track (mountain biking) Bunny hop (cycling) Glossary of cycling References External links Cycle sport Articles containing video clips Mountain biking BMX