It is called athletic recruiting at MIT, but anyone can sign up to be recruited, and it does not carry much weight in the admissions process. Excellence in a sport is considered the same as excellence in anything else -- being a talented athlete will not get you further in the MIT admissions process than being a talented musician. In other words, being an athletic recruit at MIT is not much of a tip (if it's a tip at all), and an athlete won't get into MIT unless he or she is highly qualified academically first.
You can join many sports at MIT without high school experience, though some have rather rigorous tryouts. If you really want to join a sport without experience, you may consider joining a
club sport, many of which are explicitly instructional for new members.