I’ve been training in a judo dojo once a week for the past three weeks now. I was recommended to do cardio as part of my gym (not in dojo) training.
A lot of my dojo mates probably don’t even go to the gym. The Judo training itself that I do weekly is rigorous and cardio-intensive. I’m thinking maybe that by itself can be the cardio I do. But do you think I should do extra?
I’ve been lifting far longer than I’ve been Judo training. Twice a week full-body. I’ve been steadily getting stronger despite not gaining weight. That’s what I’ve been doing for what it’s worth.
I would personally say cardio is only important if you want to compete, or if you feel that your Judo randori is being severely held back by your cardio. It really depends on your goals. Personally, I don't train cardio on the side. However, I train BJJ more than the average hobbyist, and my competition classes are just 1.5 hours of hard and intense sparring, so I don't really need to. Before I had competition classes available to me, I had a routine to develop my cardio for competition. I used this routine because running was causing me knee pain.
I started off like this:
5 minutes of 5 burpees, 10 pushups, 15 squats. Keep repeating these exercises in this order until time runs out.
Eventually, I started doing:
10 minutes of 5 burpees with pushups at the bottom, 10 clap pushups, and 15 jump squats. At some point, I would get too exhausted from pushups and my chest muscles were burning too much to keep going, so I'd stop doing pushups on the burpees, and I'd do pushups on my knees until the end.
I would do this routine daily for a few weeks leading up to my competitions. This routine is perfect in my opinion because it is easy to track how well your cardio is developing, and also easy to make it more difficult by using harder exercises or doing it for more time. It will not only increase cardio for your judo but also help your body get used to lactic acid build-up and help your muscular endurance. Maximum power and strength are great for combat sports and
I know that you have always believed it to be the most important factor. But over long rounds of sparring or fighting, you need muscular endurance and cardio to maintain your strength/power output. This routine should help with this.
Lastly,
I would highly suggest against running for cardio, regardless of weight. Unless you want to go for a run once or twice a week, maybe three times, out of enjoyment, I think it is an outdated form of cardio for combat sports. The only time I would see it justifiable is HIIT sprints, such as 20 rounds of 10 seconds sprints, and a 5-second jog, which was part of my boxing conditioning a few years ago. However, running places a lot of stress on your joints. Furthermore, swimming can help you burn twice the amount of calories for the same amount of time and is easier for the joints. It also has benefits for muscle recovery and therapy.