How to Improve Your Style, Dive Longer

Have you every watched a shark as it moves along the reef? You see its smooth almost majestic movements, the stream line body, and the relaxed manner it moves into a school of fish. You know that it has power and great speed, however, the shark only calls on it when needed. The shark has evolved to be efficient under the water, scuba divers have not. We have to work at it. The way we move through the water greatly impacts the energy we spend and the air we consume. It is a skill that takes time and conscious effort to learn and sadly many divers do not even try. Often, it is a case that we do not know how bad we really are, it takes someone to tell us or show us.

What is a proper form

The proper form will keep you moving in a stream line manner, much like your favorite shark. Your body from the head to your knees should form a straight line. Your head should be forward facing and you knee bent to a 90° angle. This may sound easy but it does take a little work. When you first start working on your form, do not concern yourself too much that you are not horizontal. The position of your weights will affect the horizontal position. Once you have the form proper or at least close, you can adjust the weight trim.
Most people have poor posture, no matter how many times our mother told us to stand up straight. We will find that our muscles have remembered those positions we normally use. When we float, the body will relax but may not necessarily form the position we need. Many will find their natural position is with the rump up higher than the spine. This forces the legs down, now when we kick we are forcing our selves up as well as forward. The best way to correct this is to arch your back slightly, square your shoulders and stretch your chest. This is the form you will see parachutist take in free fall.
Your knees should be bent so that your calves are slightly above your back and the ankle relaxed allowing the blade of the fins to be parallel with your body. Your hands are not a part of your propulsion underwater. They should be held in a stream line position if they are not in use such as holding a gauge or a light. Many divers will hold the arms in front of them, one hand lightly grasping the other wrist. Arms at your side or folded across your chest are also popular means to stay stream line.
I became certified at a local dive center near where I was living for a year. After becoming certified, many of my dives were with my instructor as the dive master. We would spend our 5 meter safety stop working on my and my dive buddies form. The instructor gently controlling our body positions to help create a muscle memory. That is something you and your buddy can do.

Using weights to adjust your trim

The article on buoyancy control briefly mentioned trim. Your body has a center of gravity (COG), a pivot point if you will. Like a seesaw you want to keep the weight on ether side in balance. The further away from the center of gravity the greater the impact weight will have. While the location of your dive weights are important, it has to be used in conjunction with other items. The cylinder is often overlooked as an element of trim. It’s position can matter a great deal as it is on both sides of your COG. If you find your trim changes between your first and second dive, the location of your tank may be the cause. Most BCD’s have an adjustable loop that fits over the neck of a dive cylinder. You can use that strap as a guide to position your tank each time. When you find the proper position for your tank, tighten the loop. Each time you place your BCD on a cylinder slide the BCD down until the loop is tight before securing the dive band. Many times divers will let the boat crew change over the equipment and they may not be as detail orientated as you should be.
The balance of the cylinder impacts your trim, however, as you start working on your trim its balance is less important than it being consistent. Some BCD’s have shoulder pockets for trim weights, weights added here will reduce a positive trim, one where your chest is higher than the COG. If your BCD does not have a shoulder pocket, you can purchase weights that will clip to your d-rings. Divers can place some weight on the tank or tank band. Weight added near the neck of a tank will bring the chest down and legs up. Weights near the tank boot will have the opposite effect. As you move weights to different locations, remember that you must maintain enough weight on your weight belt or other quick release to gain positive buoyancy in an emergency. You should also account for heavy gear. If you have a large dive light clipped to your BCD, not bringing it on a dive might affect your trim.
Streamlining your equipment is an important point. Like the streamlining you do with your hands, anything outside your body profile will cause drag, that will affect your profile. Keep hoses and gauges close to the body.