(Image credit: Getty Images/ Nikolas jkd) Fancy bigger glutes this summer? "Summer glutes" are trending up, and Melissa Leach, a yoga instructor and strength and conditioning coach, says that these four simple but essential moves will strengthen yours. You can do them at home with minimal equipment, but I recommend one of the best yoga mats . I would also consider adding load in the form of a heavy dumbbell or kettlebell if your goal is muscle growth, as you'll need to progressively overload the glutes over time to see real change. Watch: 4-move workout for your glutes Strong glutes are essential for maintaining good posture, mobility and back health. Your glutes act as stabilizers and are actually powerhouse muscles, given that the gluteus maximus is the largest (but most superficial) muscle in the body and acts as a hip extensor (crucial for walking, posture and running), responsible for power, strength and stability. And that's just the maximus.…