hey everybody,

im really new to getting a nice bike, my name is paul im 21, and im a big guy, i really want to lose some weight and i found out that my parents are going to take me to europe and go biking around france germany and italy. so i really need to get in shape, i used to bike a lot but i stopped when i got a car and i have put on a lot of weight since then and i need to lose it, i will be using the bike for commuting around 5 miles per day and more on weekends so i can lose weight and get ready for europe. my problem is that i have had a problem breaking cranks when i peddled, i have extremely strong legs and never had a quality bike, so i need to know what to look for, i want to get a steel frame with a strong crank so i cant get to work, any help is much appreciated on anything, treat me as a complete newb. thank you in advance.