Joel Paavola usually unlocked the doors early. The 46-year-old fitness guru's gym, The Balance Fitness, was in a shopping center in Belle Meade, an upscale and magnolia-hung neighborhood in south Nashville. By 5 a.m. most mornings, the trainer was reportedly getting to work with his clients. On Monday around 7 a.m., three people were pushing through exercise routines when Paavola's attacker walked through the door, police say.