I believe there's a African proverb that says "if you want to go fast, go alone. If you want to go far, go together".
I've definitely found when I'm single I can easily go into beast mode. Hit the gym more often, learn/study new skills faster, go to meetups/networking events more often.
When you're in a relationship you just typically have less time. And you spend time/energy/resources on little shyt the keep ya girl content (which im not saying is a bad thing). Not to mention some (insecure) women start acting funny if they see you're too on your purpose.
So yeah, often times women hold men back