Diving is rather extreme sport and includes the need to carry heavy loads. You can cause serious damage to your health, including problems with back without special training. Ahla-diving experts advise to follow certain simple rules to minimize negative factors.
Attending diving courses many of newcomers try to show that they are no less hardy than experienced divers and try to carry tanks with one hand. You should not do this because the unbalanced load can injure the spine.
It will be safer for your back if your friend or buddy helps you to put on your equipment. He can hold your BCD with tank while you are putting on it.
In order not to overload the spine when you lift heavy loads you should carry the main weight on legs. Absolutely contraindicate to bend the back incorrect, as well as to turn body with weights. All this can lead to injuries and sprains.
For those divers for whom diving is more than just a hobby it is necessary to keep themselves in good physical shape. It is important to train muscles of the upper and lower back as they support the spine and minimize the risk of injury.
It is gona be stupid to prove yourself or others your physical advantage by hasty decisions. So it is better to ask for help instead of jerk lift heavy tanks.