#pavel stankevich #splits #spagat #grand ecart #middle split #middle splits #side-split #side splits #straddle split #straddle splits #center split #center splits #box split #box splits #hyperextension #hyper extension #hyper extended knees #hyper extended split #hyper extended splits #overextension #over extension #over extend knees #over extended split #over extended splits #flexible #flexibility #leg flexibility #leg stretching #stretch