Training extreme spearfishing, at prohibitive depths, in conditions often of low visibility and low temperatures, requires a special methodology.
In addition to normal workout in the pool, gym and outdoor, I add static apnea tests deep into the lake.
I chose Lake Bracciano, near Rome, because this volcanic lake is neither subjected to meteorological or currents problems as it happens on the open sea, also the lake water is deep already near the shore.
On the other hand, the training conditions are more extreme than those normally found at sea.
The surface temperature varies with the seasons, ranging from 12°C to 29°C. In the deep, however, the temperature fluctuates little, between 9°C and 11°C, unlike the marine one that settles all the year between 14°C and 16°C below 40 meters.