Design a dynamic gym poster that captures a group of diverse individuals engaged in a high-energy fitness class. The scene is set in a modern gym with large windows allowing natural light to flood in, creating an uplifting atmosphere. The participants, a mix of genders and ethnicities, are dressed in colorful workout attire, showcasing various exercises like jumping jacks and lunges. The background features gym equipment, subtly blurred to keep the focus on the action. Use a wide-angle perspective to capture the energy of the group. Include a motivational quote at the bottom in sleek, modern font: "Stronger together!" The overall color palette should be bright and inviting, reflecting the enthusiasm of beginners embarking on their fitness journey.