I have just finished the BBB 6 Week Challenge and wanted to share my experience.
I completed the 5x10 @ 70% challenge in every lift except for the Press, in which I failed in the third set and instead did 50 reps in total
This wasn't the case with it as a main movement, and I broke PRs almost every week.
My Squat also progressed very well. The Deadlift is currently my best lift, and its progress was fantastic in the past 6 weeks. On the other hand, my Bench sucks. Although I set PRs in the first 3 weeks, there was no progress in the last 3. I understand that they don't progress at the same rate and that some may skyrocket while the others stagnate, so I will keep pushing. But of course, any tips on the Bench is highly appreciated.
For the people who want to try this challenge or any variation of BBB; although you will read what I am about to write in every thread about the BBB, please do follow this advice if you want to progress:
1) Eat 1.5g per pound / at least 3g per kg of protein every day along with as much carbs as your body can tolerate without making you morbidly obese.
2) Do the program as written. I can not stress this enough. Do not add any extra assistance, and do not underestimate the work. The first weeks may look easy, but once you get to 60% it will be really tough, and 70% will make you suffer (especially the deadlift). I did make the mistake of underestimating the work and adding assistance, and even the very insignificant extra work I did in only one workout made me realise the mindlessness in this idea.
Thank you Jim for every answer you gave me during those 6 weeks, and I can't wait to start the SST after a week of deload.