At the beginning of the video, we see James Jeffries jumping rope before his fight against Johnson. He appears again at the end of the video, jumping rope during footage from 1901, when he was preparing for his bout with Gus Ruhlin. How did Jeffries’ rope-jumping ability compare to that of other heavyweight champions? This content is protected
I mean it's not as virtuoso as, say, Tyson's and lacks the fluidity of Ali's, or even Liston's. He seems to keep veering off to the right. But, just judging it as a cardio exercise, it seems to do the job. He's burning a lot of calories and increasing the heartrate. What more does it need to do?
