A’ Clach Thogalaich, the “Lifting Stone” was an old rite of passage for men on Colonsay. Chuir e ga oth eadar a’ chlach thogail ‘s an talamh (a breeze between it and the ground) was how to demonstrate your strength. It is purported to weigh 280lbs (~120kg).
Photo is by the late Peter Martin (oldmanofthestones.com) who wrote a book on the old lifting stones of gaeldom.