Ties used to have an actual function aside from just decorative menswear. They were originally used as napkins.
If you want to work out, go for a run, or stretch out, put on sportswear ahead of time in your day. Dressing to work out might nudge your consciousness into being ready for it. Plus, it gives you one less barrier to overcome. You might also be influencing people around you. Other people might think ‘this is a good idea’, especially if opinion leaders give the good example.
“Don't be into trends. Don't make fashion own you, but you decide what you are, what you want to express by the way you dress and the way to live.”