There are numerous videos available online that aim to explain what is meant by mindfulness. Inevitably, these vary greatly in terms of quality.
They also vary quite a bit in terms of their usefulness to traders and you could end up spending a lot of time being lectured on material that is not all that relevant.
We have hosted some videos that I think you will find useful:
What is Mindfulness? (4 minutes)
Trading with Mindfulness by Mark Soberman (5 minutes)
All it Takes is 10 Mindful Minutes by Andy Puddicombe (9 minutes)
The Secret Powers of Time by Philip Zimbardo (10 minutes)
Report on Mindfulness from 60 Minutes (13 minutes)
The Power of the Present Moment: Eckhart Tolle (36 minutes)
Stress Reduction and Healing (Google talk, 1 hour, 15 minutes)
All these videos have been produced by other entities and placed in the public domain. They are hosted here for information purposes only and this site has had no editorial input into the contents.