The story centers on Tully, a woman who decides to take a break from her long-term, "safe" relationship with her boyfriend, Simon, to explore life on her own terms. Her life changes when she begins obsessing over a man she sees at the gym every night—.
Alongside the romance, there is a secondary thriller plot involving a CSI investigation into a series of murders. Gym Junkie by T.L. Swan
The book is known for its "angst," featuring heavy themes of betrayal, guilt, and self-discovery. The story centers on Tully, a woman who