I think that for static you should train very much condition training (low heart rate, many red bloodcells).
But for dynamic you should train your muscle to get used to work without oxygen, walking apnea, interval (over 90% of Max HR) and gym training.
Ofcourse the best is to mix this so that you will be good at both things.
I have very hard to find a good mix, either way I'm good at static or dynamic, not the both thing at same time.
I train about 6-10 times a week, it depends on how hard training I do or when I am recovered.
I train running (8-15 km, not when I do intervals), swimming (monofin swimming), cycling, gym, yoga and ofcourse freediving.
I must learn mouthfilling to the summer if I will come any deeper
The key is training, training, training, training and a good technique, I think?
Freediver15 (soon I'm 16 and could start competing, YEHA!:-)