Best option for loose abdominal skin that can only be seen when stretched? (Photos)

Clearly Dr. Google & Dr. YouTube have led you to deciding upon the alphabet soup of expensive, fancy-, & alluringly- named, "bells and whistles," energy gizmos. What I can emphasize, as I do to all my regular followers is "buyer beware," since the hard science to back up the use of these devices unfortunately lags well behind the heavy marketing hype and social media buzz to promote them. I have been using Profhilo, now known as Skinvive in the U.S., an injectable, skin booster/biomodulating HA product for hydrating and tightening crepey abdominal skin, as well as the crinkly skin of the upper inner arms and inner thighs for quite a few years already with gratifying results. You would be wise to consult with an experienced, board certified cosmetic dermatologist and be appropriately wary of all the here-today-gone-tomorrow gizmos being hawked out there. Hope this helps.