Despite daily practice, I'm still finding half lotus difficult -- takes me 10 minutes or so of warm-up before my legs will even consider it, and even then one knee isn't exactly at sea level. Plus (probably because of the too-high knee) all the weight of the crossed leg comes to bear on the top of the foot, just above the ankle, so I can only sit for about 15 minutes before it gets painful. I've been wanting to lengthen my sittings. If it's just not possible with half-lotus, I might switch to a different posture, but I'd really like to make this work -- when it does, it's wonderful.
Any recommendations -- stretches, exercises, etc? Thanks in advance.