Ive tryed about all the excercises you guys suggested to me. It worked out pretty well.
Im still improving every month.

The 82,5 meter on the surface and the 12,5 meter underwater as slow as possible really works out great for me. I learned to relax more when im laying still during a trainingmatch.

My strong point with underwaterhockey is swimming big distances in a very short amount of time. No i'm more relaxed its easyier to swim much further and longer.

An other excersise that I use is 25 meter underwater and 25 meter back on the surface. You have 1 min to swim this 2 lanes. You repeat it about 8 to 10 times. The first 6 lanes are sometimes pretty heavy, after that your body is getting used to it, it becomes easyier. In january I want to do it in about 40 seconds.

One of the biggest improvements is buying other fins. Ive switches from Mares Avanti Excel to Quattro's. Lower heartrate and bigger distances.

if anyone has more suggestions, please let me know. During the tuesday trainingsessions our team used the skilltraining that you guys give