I've written extensively about this before, so I won't go into depth on the subject today, but:

Powerful, snappy, well-performed 1 hand kettlebell swings are a super underrated glute and grip builder.

Don't forget, the hip extension pattern is meant to be a powerful, explosive movement pattern. The glutes respond well to a blend of high tension, slow, heavy moves (like RDLs, hip thrusts, squat/lunge exercises) along with powerful, fast movements (like kettlebell swings, power cleans, jumps).

1 hand swings add extra glute stimulation due to the off balanced nature of the movement.

Pick up a 70+ pound kettlebell and swing it heavy in one hand for 12-15 reps. You'll understand.