Free agent Colin Kaepernick working towards NFL comebackQuarterback Colin Kaepernick conducted a 90-minute private workout in a private practice field on Thursday morning in the Houston area.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceQuarterback Colin Kaepernick conducted a 90-minute private workout in a private practice field on Thursday morning in the Houston area.Loading recommendations... Please wait while we load personalized content recommendationsPublished Mar 15, 2018 | Modified Mar 15, 2018SI STAFFShare on FacebookShare on XHome/NFL