Now I think this is in a western setting but not sure but saw on RFDTV
Per Linda Parrelli
"If your seat is correct and your sitting as you should with seatbones, you can reach back and easily touch your horses rump, if your not, you cannot reach your horse". Meaning if your roached forward like I "LOVE" to do you can't get it easily. This little tip has helped me so much I can't tell you how many times I've re-corrected my very bad habit with this.