Came across these a few months ago. Been working on the goblet squat with a 60 pound dumbbell and it can be a bit of a challenge, not as intense or stressful as barbell squats. Especially good if you dont have access to a gym, just substitute the dumbbell for a sandbag/bag of cement/small child and you’re good to go.
http://www.davedraper.com/pmwiki/pmwiki.php/PmWiki/GobletSquat