@mmmplak
I have garmin watch so I use garmin connect app. it has a feature for planning your weight training routine. I use it because I don't want to drag my phone into the gym. it allows me to do everything through the watch.
I also use Simple Workout Log. it is indeed simple and I love it.
Do you get logged out constantly? I have to log in into kbin every time despite having "remember me" option turned on. but maybe it's just my browser 😒