From Al Ciampa's article on military deployment prep:
Swings
One-hand swings should be performed as described in Simple & Sinister. Two-hand swings have to be overspeed. But here’s my version, an excerpt from my training manual:
“A proper swing is a tug-of-war between the opposing body lines: posterior v. anterior. The glutes, hamstrings, and quads forcefully catapult the bell forward, while the lats, abdominals, and hip flexors catch it and throw it back—compress the posterior spring, fire the spring, compress the anterior spring, fire that spring, then do it again. Both the hinge and plank position are maximally tight—maximum feed-forward tension—for the time the bell spends flying out, one is “relaxed- tight”.
Throw the bell from the coiled spring of the hinge into the tight plank—stay connected to the bell—”catch” it in the plank and throw it back down. Recoil the spring and snap back to plank. Repeat for a set of 10. Check your heart rate. Wow.