Most of us, do not have time to lift weights, do strength and conditioning, and train Jiu-Jitsu or whatever various grappling style upon which we focus our time.
At least, that's what we tell ourselves
Time, or lack thereof, is the biggest excuse that exists.
"I don't have time."
If they were handing out a thousand dollars cash,
That being said, in order to maximize supplemental weight lifting and time for sprints, crossfit, whatever other exercise you do, it needs to be sometime other than before or after Jiu-Jitsu.
When we say we don't have time, most of the time, we are being disingenuous.
We have time, but we clearly choose to spend it on other activities.
Perhaps its XBox. Perhaps it's sleep. Perhaps we don't get up early to train b/c we'd rather play XBox til 2am, then 6am feels too early to work out.
Perhaps its laziness or lack of drive. It can be many things, but it is not a lack of time.
I'll go back to the pregnant woman example I've cited earlier. Or the young child excuse.
I've seen women, either currently pregnant, with a kid in the stroller, or with a toddler old enough to walk around, working out, crossfitting, even though, I'm sure, they could easily fall back on the tired or not enough time excuse that is all the rage in the modern world.
At the end of the day, you are the one ultimately responsible for your own success.
You can look back and see progress and work and effort or you can look back and see mediocrity in the form of excuses.
The one area of my life that almost no one seems to claim for themselves (be it work, family, loved ones, who or whatever) is the early morning time.
Most of the world would rather sleep if they are not at their job deep in the bee hive/collective.
This is the single best time to do any other thing you wish you had time to do during the rest of your time.