Before starting stretching

Hi all , i m very rigid on my harmstrings, i can't reach 90 degrees when i sit down with legs extended. Wich one is better first : middle or front split ?  Thanks all .. ( i itred to strech for the middle but it's very difficult , also the lateral squat )

Front split

thank you !

That was fast

For the posterior chain, which is usually strong but tight in people I train with, weighted mobility (including bodyweight stall bar work) really comes into it's own. The Foundation series has a number of drills for pike and straddle which work hard and fast on the posterior chain and I frankly love them

thanks jon , i'll check some weighted exercises on the net . i want to do them on far days from front split stretching , for exemple i love jefferson curl ,  but i m so rigid on my harmstring , i have to wait . FIrst i want to achieve the 90 ° then i'll work on jefferson and pnf