Honesty means being truthful, always seeking to do what is right. Being honest means we always tell the truth and try to do what is right.
Lying is wrong because it makes people feel tricked and hurts them, and breaks their trust in you. When someone trusts us we should respect their feelings and not hurt them. By being honest you become someone people can trust, admire and look up too.
You can be honest in what you say and honest in what you do. You can be honest in your training also, trying hard, training hard, be open in admitting mistakes, honest in your relationships etc