I am being pedantic here, but bodybuilding/strength training definitely does not have a smooth progress bar. You need to be prepared for there to be weeks, or even months, where you are just not lifting what you were able to before.
The point is those are activities with highly repetitive efforts and you can adjust after each one with feedback.
Golfing is not like this, if you miss your first swing, you can’t micro adjust for the second one, because it’s going to take place under completely different conditions where the feedback you just got does not apply usually.
Running is a great example because a dedicated runner, even a hobbyist, can expect to see 3-5% improvement in speed/endurance or whatever every season. But no runner expects to see improvement during a single run. But the same isn't true for activities like golf or language acquisition (my own example).
First, you actually do quite a bit of periodization at the season level, so you might have a long base block, followed by a more stamina/quality oriented block, then race specific sharpening, followed by taper and an A race, and then rest. Improvement is distinctly non-linear across these phases, and you'll actually start each season fairly far behind where you were at your peak.
There are also plateau effects, where you've basically adapted as much as you can to an existing stimulus and you need to find new ways of triggering adaptation.
This is something a lot of casual athletes don't notice because there is a very steep development curve for the untrained, so you just getting better very quickly. Once you have been training for years, gains come much slower.
From 2013~2023 I would struggle to row 10km in any duration. My typical daily routine would be 2~3km. From 2023+ I can row 10km every single morning 365 days a year without any issues.
Some kind of step-wise change occurred about 2 years ago. It wasn't a gradual or linear event. I vividly recall a day where I just kept going and going without paying attention. I finally look down and there was 14km indicated on the display. At this point I figure I can do 4km less than that every day since it wasn't too bad. 80% of it seems to be psychological. The human body is incredibly adaptive, even over short time frames.
Confidence is probably the most important thing in making progress with things like weight lifting. Definitely in Olympic lifting. I've seen people go from a 135lb to a 225lb clean & jerk in one day with a good coach.
I do like his point about taking all the mulligans though!
Not at intermediate or advanced levels, but for beginners on a well designed program like “starting strength” it typically does.
Once you get adapted it gets harder and harder to find new stimuli that will trigger new adaptation without breaking you down too much. If you're interested in running, Steve Magness and Jonathan Marcus talk about this quite a bit in the On Coaching podcast (https://www.scienceofrunning.com/podcast-2?v=47e5dceea252).