But if you aren't strong, you'll never be good at the sport.
Well if you're going to be serious about armwrestling & treat it like a sport, then obviously. You're never going to be good at Tennis without some basic strength & stamina, no matter how good your technique. I thought you meant just like beating the guys in your class or what have you, for which technique only-training definitely would do the job.
But yeah, the search engine doesn't seem to be the best, but it still finds some advice.
Raton: STOP DOING JUMP ROPE BEFORE YOUR WORKOUT!!!! You need to prioritize what you do in a routine to make sure you can perform well on the most important lifts (one of which = pullups). If warmup-cardio has a negative impact on a compound like squats DL pushups pullups, then you have to sacrifice it for the greater good of the routine. Do it after.