Just wiki'd this. Learned a lot today about tucking! Tucking In downhill a usually rider crouches his/her body into a compact position to reduce aerodynamic drag. There are a wide variety of tucks but most fall within five categories: American, Euro, Hybrid, Brazilian and classic. An American tuck involves the rider tucking his/her back knee right behind his/her front knee and leaning onto his/her front thigh. Many find this tuck to be one of the most comfortable to hold while providing for a very flat, aerodynamic back with a small frontal profile. This tuck results in larger draft pocket behind the rider, which is used in a race to pass. A Euro tuck involves the rider tucking his/her back knee right behind his/her front ankle and leaning onto his/her front thigh. This tuck gets the rider very low, but many find it to be uncomfortable and it creates a larger frontal profile which creates drag. It does reduce the draft pocket by guiding the air downwards due to the curved back. A Hybrid tuck involves the rider tucking his/her back knee into the middle of his/her front calf. This tuck provides a balance between the Euro and American, taking some of the advantages and disadvantages of each. A Brazilian tuck consists of the rider placing his/her back knee directly onto the board next to or behind the front foot. This Tuck has largely fallen out of favor for competitive riding. This is because it creates a very large frontal section that dramatically increases aerodynamic drag. It's mostly used by beginners or as a resting position for some people during very long runs. A classic Tuck is one that was primarily used in the 1980s and 90s. However some modern events, such as the MT Tabor Challenge in Portland Oregon, require this tuck to increase the difficulty on mellow hills. The tuck involves placing both feet at the front of the board, touching with one foot slightly behind the other. The rider then crouches down somewhat similar to a modern tuck. This tuck provides a severely reduced amount of control due to the rider having minimal control over the rear trucks. Further the stance has higher aerodynamic drag than other tucks.