McKay's Mill Trainer is a personal training service based in Franklin, Tennessee, serving the Franklin and Cool Springs area. The business is led by a nationally certified personal trainer and offers instruction in TRX, rope, and kettlebell fitness. Its activities also include youth fitness classes, a running group, a free 10-week Couch to 5K plan, and fitness challenges focused on weight loss and active pursuits such as walking, running, hiking, and biking.