What i like to do is dive down to 30M with a rope, then tie it to some underwater structure and secure the other end around My neck with a perfect bowline and then release My weighbelt. I can achieve several hours underwater like this.
If this is no use to You then I recommend a 7mm open cell wetsuit... once you are comfortable its just a matter of relaxing and doing everything in slow motion
P.S. don't set goals
If this is no use to You then I recommend a 7mm open cell wetsuit... once you are comfortable its just a matter of relaxing and doing everything in slow motion
P.S. don't set goals