Here is a less than 15 mins workout for your glutes and your core. All you need is a bench / chair / sofa and a circle resistance band.
There are 5 exercises in this workout - all are completed with the band:
Seated single leg side taps - 20 reps (10 each side)
Seated knee lift marches - 20 reps (10 each leg)
Hover abductions - 20 reps
Hip thrust or bridge abductions - 20 reps
Hip thrust or bridge holds - 30 seconds
Here is a follow along video: