OK, a week makes a big difference. I stuck it out with the Brazil Butt Lift, and I can honestly say I am really enjoying it now! The initial soreness (PAIN!!!) diminished quickly, and I'm starting to really 'get' the the workouts now so I'm feeling like I'm hitting the moves and not just flailing around desperately trying to keep up.
I was really dreading the "Sculpt" workout that started in Week 2, but it turned out to be a fantastic workout with dumb bells and I enjoyed it a lot! I was initially a little concerned with it because I'm resting my shoulder/arm from the swimming injury, so I decided to use a slightly lighter weight to build into it gently.
Another new thing in this week (Week 2) was adding the band to the High & Tight workout. I was nervous because of running, and how fatigued my legs have been, but I decided to give it a try anyway. And I'm glad I did. My legs really need a lot of strengthening, and I believe that this will make me a stronger runner eventually and can aid in injury prevention.
Speaking of running, it is still going well. I bumped up to 3/1 intervals again and haven't had any pain despite my legs being more fatigued because of all of the BBL work. I am not planning to bump up the intervals again until after I'm done with BBL, but we'll see how it goes!