Everest BC - Training & Fitness This trek is suitable for all abilities, with the correct training. You'll be trekking for multiple consecutive days, at high altitude and in varied temperatures, so good cardiovascular fitness is required – the fitter you are the more you will enjoy your trek. You should aim to walk regularly in the hills with a light pack (7-10kg) and follow an exercise routine to strengthen your core and legs and to increase your cardiovascular fitness. We recommend this training guide for trekking expedition clients. You can find out more about how to prepare for high-altitude here.