Half split stretch: While kneeling, extend one leg straight in front of you. Place your hands on the floor on either side.
To do the splits, you'll need to consistently stretch your hamstrings, hip flexors, and glutes. Stretches for the splits include the butterfly, piriformis, and kneeling hip flexor stretch.
If you've been hitting back squats hard, it may be time to introduce a different exercise: the Bulgarian split squat.