When training people who are newer to kettlebells, often you will see them pick the bell up off the ground by standing up and THEN swing the bell behind them. That method is not optimal for a few reasons. In this photo posted by Prevention.com, you can see that the starting position of the bell is in front of the lifter, making a triangle with the feet. This allows her to tilt the bell toward her which gets her posterior chain loaded and to pack the lats and get fully engaged from the get-go. Her first movement is then an aggressive hike back and an aggressive stand up. Starting in this proper alignment allows for safe mechanics and muscle engagement. When someone picks the bell up off the ground first and then starts swinging it can be dangerous by facilitating rounding of the back and a disconnected body. A safe swing starts out just in front of the lifter, makes a triangle with the feet of the lifter and allows muscle engagement from the start.