Is there any manufacturer that makes specific anti-aero training jerseys for increased effort at lower speeds? Sort of like a braking parachute but more practical and subtle?
My reason for asking is that I want my fairly short commutes to give better training while not requiring unsafe speeds in city riding.
Edit: and just to explain.. I'm not so keen on adding weight to my bike or person - not only because it is unpractical, but also because it would make the effort more uneven and more like interval training rather than sustained effort.