Intensity can be increased with resistance, incline and speed...but most people forget it can also be increased by adding distance. The further the distance you can cover from ground the ceiling the more muscle groups you're recruiting and the more you're taxing your cardiovascular system...making the exercise both intense and efficient.
Dumbbell or barbell thrusters are a deep squat into a overhead press. You utilize the momentum created by the squat to press the bar or dumbbells overhead. The bar or dumbbells return to shoulder height for the squat them press right back up for a continuous, smooth movement. Here's a quick demo: