Exercise bikes that people buy for home use usually look similar to proper bicycles but they do not have true wheels. Unlike bicycles, their primary use is for exercise rather than as a form of transportation. They are great for increasing fitness levels or training for a cycle race. They are also frequently used in physical therapy.
This is a distillation of years of experience in how to draw better cartoons. Keeping them simple and neat is important to the overall appearance of the comic. Your readers should notice the picture then their eyes should naturally flow to the caption without a lot of distraction. Too many details and busyness can get your readers confused and take away from your gag. The focus of comic strips is to help others laugh and smile through words and pictures. Keep it simple and funny.
