A single leg deadlift is slightly more challenging, as it requires good balance and core control. it can be done without any weights, or you can add one or two dumbbells, but I recommend starting with only bodyweight and working your way up.
Place your left foot in line with the chest line, then place the dumbbell in your right hand; start to extend your right leg back and up, like an airplane pose, and hinge from your hip on the left side and bend that left leg about 45 degrees. Then, return to standing position while trying to keep your right leg off the floor on the way up. Do the same movements on the opposite sides, changing the leg and the arm holding the single weight.