Before going for any kinds of trip the major thing is to consider your health and your physical condition above all. You need to be in good physical condition before the start of the trek. Your strength is important to determine the working trail or the working hours. If you have good strength and capability for hardship join for a fair and tough trekking else just have moderate or easy trekking trails. So any one, with a pair of strong legs and the spirit for adventure to explore the exotic will enjoy the thrills of trekking in the hills of Nepal.
Most people of good fitness for their age can complete our trek. Many activities on tour are optional, so you can choose them according to your fitness level. Trekking in Nepal is walking holiday at your own pace enjoying the Himalayan vista and cultural contrast to its fullest. An enthusiastic attitude is far more important at this stage in the game. You can be the fittest person in the world but if you have no genuine interest in trekking it will not become a long term activity for you.