Taking the subway from the airport to the gym is FREE and convenient. Pick up is curbside at each Terminal. Take the Silver Line to South Station and there change to the Red Line and take that to Kendall Square. The gym is a short walk from the subway station.
For those arriving late at night or early morning and require pick-up, contact Beth Sopka (617-451-3563, email@example.com) with full details of your arriving and departing flights.