No ideal amount. Take bench press as for example Beginner warmup: 45x10, 75x8, 95x5, First working set 115x5 Advanced: 45x10, 135x8, 185x5, 225x5 First working set 250x5 Somewhere between 2-4 warmup sets is solid for heavy lifts like bench. If h already did bench and ur going into another push exercises one or no warmups is okay. Remember, this is all about how you feel, if ur pushing heavy weight, you’ll need at least one warmup set usually. I think he made a good point for rest before ur first working set. The warmups should not be rested in between for the most part, unless ur like seriously powerlifting. Otherwise just rest after ur last warmup right before ur working set. Also, Jeff Nippard is goated for this video. Because almost all of u are using the superset method lmao. Which is blessed for him to say!