UPDATE: This content is originally from Stephen McCain of American Gymnast (AmGym.com). Steve also took the photos. It’s from one of their training articles. (Check that out right now if you have not seen them already.)
I love this site. Especially their fantastic Gymnastics on Demand video clips.
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Tip:
One of my favourite leg conditioning drills is drop down, stick landing. Not only is it very specific for training landings, but the eccentric contraction of the legs on a challenging landing is great for leg strength.
Most often we bounce off a trampoline, landing on a competition landing mat on the floor.
Only “stick” landings count.
From a high surface, such as the bar or a stack of mats, jump off to a stick position on the landing. Centre of gravity should be directly over the feet when landing, with arms stretched outright to assist in maintaining balance. Avoid bending your knees past 90 degrees during the landing.

From the GymSports New Zealand November 2007 newsletter (PDF) – Coaching | NZ Gymnastics
