Some background:

Achilles tears occur in 3 areas:
-Myotendinous junction - usually related to eccentric contraction and acute injury
-Watershed zone - unlike most tendons, the Achilles has no sheath.  Instead it has a thin membrane called the paratenon; as a result the midportion of the tendon often becomes chronically hypoxic and heals with excess scar tissue after minor injuries.  This results in chronic tendinosis and eventially tears.
-Calcaneal insertion - often due to developmental calcaneal deformity and footwear; but can be seen in athletes as well

Most athletes with ruptures have the second kind.  These are chronic processes which is why pros tear it late in their career.  Tendon pathology can be accentuated by steroids and fluoroquinolones (e.g., ciprofloxacin) as well as diabetes and other metabolic conditions.

Stretching probably has little effect on preventing this process.  Warming up before working out, increasing blood flow, is probably more useful. 

Popping posteriorly could also be related to a bursitis, anomalous muscles, posterior ankle impingement or other pathology.  Achilles tears occur suddenly, usually without warning, and you'll know if it happens!!
 

I know THEY don't but it seems to me they would hook up with someone of means.  After all, you CAN marry for love AND money.

And yes.. although I like the pale Goth type too, perfection comes in many forms, and Ms. Dettwiller is just about perfect... in fact, she's Dina-licious!

We've all been enjoying the lovely and talented Mel but have you noticed her surroundings???  A depressing collection of fleabag hotel rooms, grandma furniture, and shower stalls from Psycho.   

Please please someone treat her nice and take her to a Four Seasons.  Or a 5 star resort.  Jeez.

Some background on this topic...

As mentioned, AC joint pain is very common in weightlifters.  Usually it can be related to bench pressing, which maximizes load across the joint.  This little joint with a 1cm2 area is the only osseous connection from the arm to the torso.  A large load across it therefore creates massive force/area.  Imagine a 160lb guy stepping on your hand.. unpleasant.  Now imagine a 160lb FBB in 4" heels stepping on your hand.  Same principle of force / area.

This causes a condition called clavicular osteolysis (can also be caused by AC separation).  At this point the joint is very tender and it hurts to bench press, do push-ups, etc.  Incline bench unloads the joint somewhat and can be used while healing.  Resting will result in a cure.  If the injury continues, osteoarthritis ensues and pain becomes chronic.  At this point a Mumford procedure is performed (resection of the distal clavicle), which can relieve pain (no joint, no pain).  This is well tolerated, as you all have documented.  However, shoulder pain can be from other conditions such as a labral tear, and such treatment can make the shoulder more unstable.  AC separation usually heals by itself but needs rest from training.

So.. I urge caution before jumping into this.  I've seen weightlifters ruined by the wrong surgery as well.  See an orthopedic shoulder surgeon.  Get your MRI and have it read by a musculoskeletal radiologist.