With climbing, you are taking a step higher than just trekking. For trekking, a basic level of fitness suffices. However, climbing or an expedition in the Himalayas takes a lot of will and strength. Especially for the expedition, you must have some summit experiences. It is also essential to carry out some stamina and rigor-building training for a few months (climbing) to even a few years (expedition). Undertaking a climbing or an expedition without previous experience is unsafe and may put you in danger in the Himalayas.