There are lots of free videos online working as perfect resources to learn, work and do workout. And here is a good way to download these online videos for personal use, using the tool Cisdem Video Converter (https://www.cisdem.com/video-converter-mac.html).

It helps me to download videos from YouTube, Vimeo, Bing, DailyMotion and basically all mainstream websites to get video sources. Also, we can use this tool to convert videos to other formats, so we can play on our device anytime anywhere.