We often think that the only way to get the heart rate up is with high impact exercises - Jumping jacks, jump roping, squat jumps, etc. Those are great exercises, but not everyone's joints are thrilled with all that pounding, making it tough to find moves that really challenge you.
Do it right: Hold a dumbbell or a kettlebell by the horns at your chest and lower into a squat, going as low as you can and bringing the elbows towards the inside of the thighs. As you stand up, take the weight overhead and rotate to the right, pivoting on both feet. Lower and repeat for 1-3 sets of 8-16 reps, alternating sides.