BJJ Legend Marcelo Garcia talks in detail to Stuart Cooper about the reasons why he never did strength and conditioning for more than a period of 8 months.
Marcelo doesn’t lift, doesn’t run. He just does BJJ to become better at BJJ.
Check it out.
In this other video, he talks about his philosophy regarding developing your BJJ game when you are around lower belts.
For Marcelo, instead of waiting for your partner to make a mistake, you should push the pace and force the partner to defend. This will also push your conditioning for BJJ.