Ajahn uses humour, jokes, funny stories and common sense to teach us how to meditate. We forget that being physically comfortable is very important to a good meditation. If we are physically uncomfortable it is difficult to be mentally comfortable, we can't focus. Talk to your body, ask it if it is comfortable, fidget, squirm, cough but get comfortable. Then move on to relaxing mentally. Leave your heavy past in the past, forget your concerns about your future and just live in the moment.
Focus your attention on your breath and breath in "peace", out "let go".
After the guided meditation, Ajahn talks about mental health as well as general health and the benefits of meditation.