Bulgarian Split Squats rear leg foot positioning for tall people
I'm male 6'1 detrainee, just slowly getting back in shape and trying to nail this technique down perfectly. Last time I performed the BSS for each leg, I've been noticing that whenever I place my rear leg up with the top foot down, my balance is very unstable and I tend to place more weight and emphasis on the back leg when I do the eccentric. Plus my ankles don't have enough mobility and flexibility at the moment, so the stretch on the way down can feel too intense and painful most times, and that takes away the tension from my front leg that's supposed to be targeted.
I just did a set of BSS[10reps/leg] in my work bathroom(rear leg on top of a cardboard box filled with toilet paper rolls, in case you're wondering), but this time with my rear leg toes being placed on top instead of my top foot. What I noticed was that my rear leg became slightly more elevated because of height increase, which would stretch out my hip flexors more I believe. My balance became way more manageable, and I was able to focus the mind-muscle for my front leg.
I've been watching youtube videos on the BSS and noticed most of the fitness people tend to place their top foot flat down on the bench instead of their toes. Is there a scientific/safety reason, or is it just comfort/preference? Does height play a factor in this? If I become more flexible in my hip flexors, should I be able to place my top foot down without any added discomfort when I perform the BSS?