Hey, I've been practicing MOP with upstrokes! lmmfao
Just kidding but funny you mention that as lately I have been changing some things up and doing upstrokes as a variation to this drill from Ben Eller I saw a few years back that I use to warm-up. I used to really focus on my right hand as I'm left-handed but play right and would do these damn drills just upstroking for three minutes to a metronome to better my downstrokes and overall picking/getting my right hand in-line. I used to run into tennis elbow but doing variations on things such as that has kept it at bay for years.