This page is a list of external resources for strength, flexibility and rehabilitation exercises that may help you keep swim fit and flexible throughout the Covid-19 lockdown:
https://thecoloursofyoga.com/ – This is an online Yoga instructor that provides free courses.
https://www.fitnessblender.com/ – This website has close to 500 free training videos.
https://www.youtube.com/channel/UCe0TLA0EsQbE-MjuHXevj2A -This is a YouTube channel called Althean-X which focuses on muscle development exercises. It has an excellent library of videos.
https://physio.ecch.org/self-help/video-guides/ – This is a resource from the ECCH Physiotherapy service which focuses on exercises for rehabilitation