I started MI40 in September. Got 3 weeks in and had family over for 2 weeks. I was still getting use to a lot of the movements. I started at week 1 again.
Both times, the first time and now this time, when I do my back/hamstring day, my hamstrings are like jello for 3 days. ETS works great for every other body part I normally suffer DOMS from. My hamstrings feel pumped and huge but they are still sore.
Had a sports massage today. Doc said they were 'tight' and I needed to ice them. I have hamstrings again tomorrow. I like hitting them hard...I just don't want to set myself up for injury.
NOTE: After starting MI40 I have felt soreness in areas I never previously felt sore. It's awesome to know that I'm hitting areas that, from what I can feel, haven't been properly stimulated.