|As evidenced in the Wind
Resistance Archive, it is vital for cyclists to make themselves as
streamlined as possible to reduce the effects of wind resistance.
Ignoring aerodynamics in exchange for comfort is not wise. Below, we
touch on the key aspects you need to consider when trying to combat the
Back. Get your back as flat as possible. This means that you should try to get it low and try to keep it flat. By lowering your back and body, you will be reducing frontal surface area and drag. By flattening out your back so it is less arched or bent over will reduce the turbulence behind the rider which also helps decrease your wind resistance. Notice how flat the biker in the pic below keeps his back while cycling. By keeping his back this flat, he slices through the air easier and quicker than most of his competition.
Arms. In general, the closer the arms are together the better. The wider the elbows and the arms, the more air that gets caught in between your arms and your body. In essence, having your arms wide open is like have a parachute open. The arms increase the width of the surface area and actually funnel the air into the body. By bringing your arms up in front of the body and having them closer together, the frontal surface area is decreased. As the elbows are moved closer to the center line of the body, the body is able to draft in the arms' slipstream. The principle is simple. You would rather push a knife through butter with the blade following the edge rather than having the whole blade try to go through the butter at the same time (cutting it flatly). By bringing your entire body in, as close to your body's center line as possible you cut the turbulence to a minimum and decrease your wind resistance.
The biker in the pic below has his forearms virtually together. Despite the hard viewing angle, you can see how close together his arms are to the center line and how his shoulders are down and also pulled into his body's center line. This is great aerodynamic position.