I listen to podcasts all the time. They’re like my 1990 company library of cassette tapes – ideal for drivers. People like to listen to them whilst going about their lives. Walking the dog, on the tube, in the gym, whilst hoovering. All digested from their SmartPhone.
There are literally thousands of really good podcasts that are freely available, so put links on your LMS for your people to download. Here’s a massive list of current ones for salespeople (my audience)
You can also produce your own. Have your experts talk about how they do their job well. Interview them face to face with a recorder or use the phone or Skype and record the call. Keep it to 20 minutes or so for maximum attention, bring in humour, care for your voice (imagine a radio DJ or YouTuber)