What are the biggest leadership challenges?

For me, is to get everyone have the same goals and contribute to reach them. A leader can be seen as the captain of the ship. You have to convince the crews that you have a precise destination and a plan to get there. When they're agree to board your ship, they have certain roles and responsibilities to take. In the journey, you'll have storms and other obstacles. When you have a solid team and you're able to drive them, your ship will remain strong and reach the destination. It's the same with leadership. You come across different types of people and you have to make them to have the same goals at work. Most of the times, there are corrupted members who will poison the minds of the on-board crews. As a leader, it is your job to remind the crews about their reason of being and strengthen the bonds. It's maybe hard to have a balance professional and personal relationships between the leader and his/her members, but it's the art of leadership.