Electric bicycles. They are widely available now and allow the user to apply anywhere from 0 to 100% effort - their choice. Coast into work sweat free, over hills, many miles is a breeze. Pedal on the way home to replace your gym workout. Or whatever you feel like. They can go up to 20mph without pedal input, allowed to go anywhere a standard bicycle can go. That means bike lanes, paths, bike racks. It is hands down the best way to combat traffic congestion without the full workout. I'm posting this because most people still don't know they exist and then some people cite that bike infrastructure is not a good transportation investment because people don't want to work up a sweat or pedal too far. Ebikes + bikes + Austin Bicycle Master Plan = awesome transportation options.