Greetings u/seceerden
I can offer a few suggestions that may serve as useful introductory resources.
Firstly, there is this online course - through Coursera (which is free) - led by Prof Stuart Phillips and Prof Martin Gibala; https://www.coursera.org/learn/hacking-exercise-health .
Secondly, another Coursera resource - led by Dr Robert Mazzeo; https://www.coursera.org/learn/science-exercise.
Finally, there is this YouTube channel that has been started recently by exercise physiologist Mark Burnley; https://www.youtube.com/channel/UCnALqirLBF4CU-5U7eeCqjQ. Whilst a new channel, he has already uploaded a number of videos covering some of the interesting exercise physiology topics (i.e. oxygen kinetics, lactate threshold, critical power/intensity). I highly recommend Mark's videos.
Hope that helps!