I'm quantitatively motivated, and almost never have access to a spotter, so I usually get my 1RM "fix" by calculating/extrapolating by using a lower weight and

I'm quantitatively motivated, and almost never have access to a spotter, so I usually get my 1RM "fix" by calculating/extrapolating by using a lower weight and counting number of reps until near-failure. Something like this helps: https://exrx.net/Calculators/OneRepMax https://exrx.net/Calculators/OneRepMax