Muhammad Ali

When Under Armour signed Muhammad Ali to an endorsement contract in February, there was some curiosity about how the apparel company would use The Greatest as a spokesman. Part of the deal was to create a product line of gear with Ali branding.

The first wave of those Ali-inspired clothing and shoes is now available.

These are the SpeedForm Phenom Training Shoes:

Ali Shoe

Ali Shoe

Here is a shirt featuring a classic Ali quote on the front:

Ali Shirt

Under Armour has also produced a video with Ali as part of its "Rule Yourself" campaign. Other Under Armour athletes with videos dedicated to this campaign include Stephen Curry, Tom Brady and ballet dancer Misty Copeland.

Ali's segment shows boxers -- a mix of men, women and children -- training in the gym while clips of his fight footage and audio are weaved in.

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