SR : Save your energy! Work on the foundation of your body, stretching, breathing. In the real rules of Jiu-Jitsu, there is no time limit, if you run out first, you will lose. Physical preparations today will allow you to do well during short bouts of upcoming competitions, but will not help you in the long run. Work the body and therefore the technique.
As I say in my book:
“If you think, you are late. If you are late, you use strength. If you use strength you get tired. And if you get tired, you die! ”
Saulo Ribeiro: 'We Should Drop The 'Brazilian' in Brazilian Jiu-Jitsu'