I wouldn't dare to post this in fundation forum, I'd be hung there by fundation worshippers straight away 
The question is: Has anyone tried or have any experience in kind of applaying grease the groove to fundation progressions for harder fbs, using steady state cycle rule of 50% of intensity ? Do you think it would make sense if I did for example FL, SPL with coupled mobility exercises 3-4 times a week spread throughout the day ? I have to say that I tried this with L sit for the last 2 months and the progress is mind blowing, at least for me. From struggling with the template progression, being stuck on tough 18 seconds per set, after 2 months I can already do nearly 40 seconds of what is more half v-sit. Maybe dreaming a bit but legs are much higher than parallel. Would applying this method to 2 -3 exercises performed throughout the day fo 3-4 days a week be safe and productive ?
Thx.