Are you sitting comfortably? Well, stop it. Beauty entrepreneur Trinny Woodall makes HTOTR history by telling Viv Groskop to Sit Up Straight! That done, the pair explore the joy of the ad lib, the value of being your own mentor, and the secrets of limitless energy.

Do you "leave it all on the court"? Viv Groskop talks to novelist Madeline Miller about the speaking secrets of teachers, what you can learn from watching others, and how Bruce Springsteen inspires her to hold nothing back.

Do you suffer from nerves? Become a professional performer! Viv Groskop talks to comedian, actress and writer Catherine Tate about why she hates flattery, her enthusiasm for extreme adventure, and - yes - how performing cured her anxiety. Plus she reveals the killer secret of dealing with Q&As...

What if it's not all about you? Viv Groskop talks to writer, actor, comedian and producer Meera Syal about fighting for diversity, failing in front of Victoria Wood and the peril and power of representing others when you speak.

How do you choose your words when lives are at stake? Viv Groskop talks to Sabrina Cohen-Hatton, a Deputy Assistant Commissioner and one of the most senior female firefighters in the UK, about self-belief, communicating under pressure and the way social conditioning effects the confidence of girls and women.

Do you know how to fail? Viv Groskop talks to author, journalist and podcaster Elizabeth Day about how to pull off a killer career pivot, how to survive a wardrobe crisis and how to fail brilliantly.

What's the worst that could happen? Viv Groskop talks to Nicola Mendelsohn, Facebook's Vice-President for Europe, the Middle East and Africa about salary negotiation, not assuming people can read your mind and the importance of not living life wondering what if...

Feel awkward about being, well, um, GOOD at what you do? Viv Groskop talks to Josie Rourke, film and theatre director, about owning your own fluency, the power of "messy spaces" and why we must never assume women are struggling to find a voice.

Does your voice go up at the end of a sentence? Always? Viv Groskop talks to bestselling historian Margaret MacMillan about conquering uptalk, the power of storytelling and the importance of trusting your team. Plus some brilliant advice for anyone shy at parties...

This girl is ON FIRE! Viv Groskop talks to MP for Tooting (and practising doctor) Rosena Allin-Khan about how faith, facts and funky music help boost her confidence.