I have a daily 4km bike ride to/from work and my solution was to buy a 22kg beach cruiser with wide tires that makes for a great workout - if I were to ride my

I have a daily 4km bike ride to/from work and my solution was to buy a 22kg beach cruiser with wide tires that makes for a great workout - if I were to ride my dedicated road bike the ride would be no workout at all. I find when I bike commute regularly, even with this short route, it makes a massive difference in my stamina for other activities I do far less frequently, namely road biking, skiing, and climbing. When there's a will there's a way! * edited for slightly more clarity.