The HST Notes say
Starting over, after the first 8-week cycle, do you skip the 15s or not? <span style='color:444444'>[Feel free to comment, of course, on why you do or do not skip the 15s.]</span>[b said:Quote[/b] ]15s can be skipped when you are about to start over after the first 8-week cycle. If you are feeling strain-type injuries coming on don't skip the 15s.