I haven't used them in a while but Fitness blender has a good selection. You can pick options on their website - cardio/hiit/low impact etc. to find what you need. No over excitable workout leaders, nice and clear, straight forward vids to watch.
They used to be free, but looks like they have a large pay section now, with some free vids still there. They were all previously on YT too so look there as well if you like the style.