What is the best exercise for low mood?

First of all, I would say that any exercise can help to improve mood and energy levels. Therefore, the best advice I can offer is try to focus on things that you enjoy and tailor activities to your own circumstances and abilities.

Some suggestions include: walking outside (short or long, depending on your circumstances); taking part in one of Joe Wick's morning exercise sessions online; signing up for an online yoga or Pilates class; or dancing to some favourite upbeat music every day, in the privacy of your own home! Uplifting music does help, but so does being outside in nature, and doing exercise collectively (even if only via the internet).