I discussed the Breadth Thrust Indicator (developed by Marty Zweig) around the 51:45 mark of the video. Here are some articles about it:
https://www.metastock.com/customer/resources/taaz/?p=37
https://www.investopedia.com/terms/b/breadth-thrust-indicator.asp
https://www.thechartreport.com/10-09-20/
https://twitter.com/edclissold/status/1314591382477180930
