Nik Wallenda trains in Florida for Chicago tightrope walk

SARASOTA, Fla. -- Aerialist Nik Wallenda trained Friday in Sarasota, Florida, for his big tightrope walk in Chicago next month.

Wallenda will walk 50 stories above the Chicago River from Marina City West Tower to the Leo Burnett Building.

Then he will walk blindfolded between the two Marina Towers.