I see the info for the progress logs, but it's not "pretty" to look at. I understand that "Dr. Muscle" is for the serious lifter and that serious lifters shouldn't need a pretty app, but I've been lifting 3x a week for almost three years, and I too need motivation to keep going. The AI is THE primary draw to Dr. Muscle, but even I need the cutesy gimmicks to keep me motivated when the AI isn't enough. 

BB.com has a feature that shows a colorful bar graph for each day/week/month of how much weight lifted. It's a fun way (though maybe not very useful) to feel good about having lifted more weight in January vs December. It also shows the total weight lifted since starting the program. I was committed to BB to hit the one-million mark, then I hit two-million about a year later. I didn't abandon BB.com until I hit three-million. 

I'd suggest coloring the Save Set button so that it looks different from the Finish Exercise button. And the Superset button should also look different from the Finish Exercise button. You pick the colors. 

Or allow for a shorter alert sound. It beeps too many times. — Another suggestion would be to have a three second warning rather than starting the alarm at zero and persisting for five seconds after zero. For example: beep, beep, beep, BEEEEEEEP!