I hate being idle. Waiting around or getting stuck in traffic. But even then, you can always be doing something.
That's why you should always carry metal grips. I've got a few of these, each with different resistance levels: 150, 200, 250, and 300 pounds.

So here are 3 simple ways you can use metal grip strengtheners to make the most of your downtime when forced to be doing nothing and instead be building a strong grip.
The first method is to go all out until failure.
Start squeezing the metal grips until you can't squeeze as hard as you did at the start. When your hand starts tiring out and your grip weakens, switch to the other hand and do the same thing.
Keep alternating between hands, pushing each side to failure until your grip is completely spent. Take a break then repeat.
This method really works your grip to the max and builds strength over time.
The second way is to pick a specific number of reps.
Squeeze the metal grips until you reach the set amount of reps on one hand, then switch to the other and do the same. Keep alternating between hands, sticking to your chosen rep count.
At some point, you might find you can't hit the same number of reps as you did at the start. When that happens, drop the rep count a bit and keep going, alternating hands until you've worked your grip enough or you're done waiting.
The third method is all about endurance.
Squeeze the metal grips and hold it for as long as you can. Keep squeezing until your grip gives out, then switch to the other hand and repeat.
This not only strengthens your grip but also builds the kind of endurance that lets you hold on tight without letting go. It's perfect for developing that unbreakable grip you need to grab and hold onto someone without losing grip.
I highly recommend getting a set of grip strengtheners. Start with a 100+lbs resistance and work your way up to 200, 250, 300 pounds as you get stronger. They're one of the best ways to turn idle time into training time.
When you are forced to be doing nothing, always be doing something.
Fight Training From Home Programs/Courses
Whether you are a professional or a beginner, you'll be spending majority of your life training solo (from home or on the road). Working on technique, drilling, developing strength and cardio. I've been training all my life. Here are some of the best programs and courses to start or continue fight training from home.