Some time back, I passed an exam called PMI-ACP. This is for experienced Agile Project Managers who wanted to get certified by the prestigious Project Management Institute. Even though I had the experience of leading agile teams for several years, I had to undergo training for the same to take this exam.
I took an online course which was offered by Joseph Phillips. He is an outstanding trainer and what I loved about his training was, his videos were short, succinct and to the point. On top of it, he is always encouraging, very positive and says "Keep moving forward".. Thanks Joe for your outstanding training and words of encouragement.