This is a video of Youtuber Brick Experiment Channel demonstrating the LEGO motor and gear system he built that's capable of lifting 102.2kg (~225 pounds). For reference, I can lift twice that with one arm. In his own words while I shotgun two of those little Starbucks Doubleshot Espresso cans back-to-back and fight a wall:
Lego PF Medium Motor with gears and pulleys lifts a hefty 102.2 kg. Gear ratio 15:1 and tackle velocity ratio 8:1. Only lego parts were used, except for the string. Enjoy! :)
I did enjoy! Did you enjoy? "I enjoyed." Heck yeah we did. Feels good, doesn't it? That feeling doesn't come as often as it used to. I used to enjoy things. But those were different times. Or maybe -- maybe they were only dreams. *blowing dandelion petals* Just what the hell does Starbucks put in those cans anyways?
Keep going for the video, which also includes a bunch of fails and pieces breaking in the second half, so be sure to stick around for that.
Thanks to Joseph A, who informed me with a couple major improvements, that system might come close to lifting his mother-in-law. You're terrible!