Software: NATURALMOTION ENDORPHIN ver. 2.5.2

Endorphin is the industry's first dynamic motion synthesis software. It is probably unlike anything else you have seen before.

At the heart of endorphin are its Adaptive Behaviours, which – unlike animation data – are completely interactive. With Adaptive Behaviours, 3D characters essentially animate themselves. Move two Football players close to each other and one will automatically tackle the other one, realistically trying to grab hold of his legs and bringing him down

Or not. It really is up to you. endorphin allows animators to direct scenes in real-time in a way they have never been able to do before. You can change parameters or change behaviours and see the results instantly on the screen in front of you. It is software that will not only save animators time, it will save money.
More Info:http://www.naturalmotion.com