How hard are 6min threshold intervals at 110% FTP

Red Lake is a beast and it’s not by accident it’s in the programme to build FTP, which is the hardest thing to do. I wouldn’t worry about completing them all necessarily and instead look for progression week to week. If you need to lower the % slightly to get through them, and need to do that less week to week, that would also be a good sign! Hang in there as the gains will come if you can be consistent.