Fitness is hugely important for success on big mountains and there is no better training than spending actual time the mountains. You should aim to complete a comprehensive training programme that builds strong legs & lungs, which will help you succeed on this expedition. You should aim to train with big boots and a weighted rucksack and spend long days in the hills, and also aim to summit multiple peaks in a day.
It’s beneficial to have experience of moving on snow and ice for this trip, although we do provide training in basic alpine skills such as moving on crampons and self-arrest with a walking axe, as we have to ensure that everybody has the necessary skills to operate safety on the hill such. Elbrus is not a trekking expedition but a proper high-altitude winter mountaineering experience.
You can find out more about how to prepare for high-altitude here.