Iam 20 years old, male. Cycling every day only for 20 minutes on MTB bike on little bit hilly terain.I have no specific diet and calories intake plan yet.
To have legs like professional cyclists you need to train like one. With only 20 minutes a day you are not going to make it. You need to find time, many hours per day, most days a week. If you want to get there in the shortest possible time, without injuries, you need to find yourself a coach. If your local sport clubs have an amateur cycling section, that's the way to go. Don't worry, your coach will tell you what to eat then.