Amplify your workout regime by training for the 12th annual Rock ’n‘ Roll Marathon (set for Sunday, May 31), a 26.2-mile block party featuring a live band at every mile along the course and a post-race concert. The Leukemia & Lymphoma Society’s Team In Training (TNT) is the official charity of the Rock ’n‘ Roll Marathon. TNT offers professional training, support, travel, and accommodations for the event in exchange for fundraising efforts, which help make a difference in the lives of more than 785,000 Americans living with blood cancers. Over the past 11 years, TNT has raised $134.6 million for the fight against leukemia, lymphoma, and myeloma. (800/311-1255, www.rnrmarathon.com)   MIA STEFANKO