The DCR Middlesex Fells Reservation Skyline Trail promises an exhilarating challenge for adventurous runners, featuring a rugged terrain filled with roots, rocks, and significant elevation changes. The course is characterized by relentless climbs and descents, immersing participants in a quintessential New England experience through dense woods. As you navigate the trail, be prepared for East Coast technicality that requires focus, but also rewards with picturesque vistas of the Boston skyline—if you manage to glance up from the challenging footing beneath you!