Hey yogis,
I need advice please, on how to stretch my adductor magnus! I find both the horse posture, and seated wide angle forward bend very difficult, almost like my pelvis is STUCK! I’m assuming this has to do with my adductor magnus, I might be wrong.
Any advice will be appreciated! 
Greetings to you Omamana! Do one thing before I think about what to suggest. Prepare to go into Upavistha Konasana, but place you hands on your hips. Start to come forward and stop when your hips stop moving. Let me know if this is about the same place you get stuck or not as far. Let me know!
I’m going to out and about this afternoon so I’ll give you a few things to try.
Lay parallel to a wall, on you side and bend your knees. Inch yourself to the wall so you sitting bones are on it. Turn onto your back. Straighten out knees and rest your legs on the wall. Bring soles of feet together and allow the feet to drop, still on the wall, as close to the sitting bones as you can. Similar to Supta Baddha Konasana. Rest here and stretch.
Follow up with: Turn perpendicular to the wall about 17-18 inches and bend your knees with soles of feet on wall. You’ll like you are sitting in a chair that tipped over. Keep the shins perpendicular to the wall and spread your thighs (and feet) as far apart as you can. Rest here and stretch.
These are both great ways to stretch the adductor magnus.
Also, supta padanguthasana, with leg extended out to the side.
Baddha konasana
Reclined knee to chest, but take leg more toward the armpit then the chest.
Hope this helps!
Thank you very much for your help! I have not had a chance to try your suggestions, but I have made a note of them and will let you know how it goes.