Busy, always on-the-go people will usually cringe at scheduling another meeting or sitting down to read a book. Try audio recording for some of their training.
The Convenience of Using Audio Recordings for Teacher Training
Most people have access to CD/DVD or mp3 players as they travel, wait for appointments, exercise, etc..
They can listen on their smart phones, computers, iPods, etc. With ear plugs, your teachers can be in a room of people and not disturb others as they listen.
The Teacher Training Module included in the Christian Education Files resource suggests some possible sources of audio teacher training. It also looks at 22 additional means of training Bible teachers. (The Teacher Training Module can be purchased separately.)