Too much volume?

Decided I want to focus on grip strength, its always interested me and I've dabbled here and there. I have the 150-200-250-300 grippers from Heavy Grip. I have closed the 250 before on multiple occasions, the 300 feels far but I want to get it.

Lately I've been using my 150 for hundreds of reps a day while travelling to work/at work and I've wondered if I am doing myself any disservice with this amount of volume or if I can keep doing this many reps everyday without hindering progress.

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u/DonutGains — 13 days ago
▲ 4 r/tires

Are my tires toast?

2018 Honda Civic concerned about dry rot.

Might be the original tires and I'm concerned they are toast. How bad are these?

Any help appreciated

u/DonutGains — 3 months ago