What defensive options does a slower boxer have?

Jab and clinch defense.Smother the shots. Roll with the shots. Tight guard. Granite chin lOL

 

Smothering/controlling opponents on the inside like Roberto Duran. Duran was far from slow and had great defense at middle and long range but his ability to easily deflect punches in a phone booth fight is a type of defense that is not reliant on athleticism.

 

Mauricio Herrera is a good example. He was always rolling with punches even if they still landed. He could usually avoid single shots very easily but he got hit a lot when his opponents put their punches together. Danny Garcia was trying to time Herrera with counters all night and has little success yet much lesser fighters like Provodnikov, Alvarado, and Mayfield were jacking his jaw violently because they either have a more awkward rhythm or they throw in combination.