Mine is delegating. I have a hard time giving up responsibility to others. Most of the time I would rather get it done myself. This is a challenge. Another leadership challenge for me is being an equipper/encourager compared to naturally being an achiever and someone who gets it done and forgets sometimes about the people with me in the process.
These are not strengths or weaknesses per se. They're just challenges in my leadership style. And something I need to (and am) working on.
What about you? Share so we can discuss and maybe offer advice.