A man in a gym using a cell phone while sitting on a bench

Compose a realistic scene set within a bustling gym, capturing a personal trainer's success and multitasking abilities. Depict the trainer surrounded by a group of engaged and motivated clients, while confidently holding a smartphone displaying an orange interface. Pay meticulous attention to lighting, casting soft highlights and shadows that emphasize the ambiance. Showcase the trainer's demeanor as they seamlessly manage interactions with clients and engage with technology. The image should convey a sense of professionalism, effectiveness, and modernity, reflecting the trainer's skill in guiding clients to achieve their fitness goals using both personal expertise and digital tools.