<Gym App>
1. Energy Green - 
                            
                            #4CAF50
                         - A vibrant green symbolizing vitality and energy, perfect for fitness enthusiasts.
2. Steel Gray - 
                            
                            #7D7F81
                         - A strong, neutral gray that conveys strength and stability, akin to gym equipment.
3. Electric Blue - 
                            
                            #2196F3
                         - A striking blue that represents motivation and focus, energizing users during workouts.
4. Warm Orange - 
                            
                            #FF9800
                         - A dynamic orange that inspires enthusiasm and warmth, encouraging community and support.
5. Pure White - 
                            
                            #FFFFFF
                         - A clean, crisp white that signifies clarity and simplicity, perfect for a user-friendly interface.

This color palette for a gym app combines energetic and motivational tones with neutral shades to create an engaging and inspiring environment for users. It emphasizes vitality, strength, and community, ideal for promoting an active lifestyle.

What features will your gym app include? Are there specific user demographics you are targeting?