During my 4th lesson my horse bucked (just once). I've noticed that some of them kick out with one leg under their belly (because of the flies I presume). She only bucked once and I remember thinking hmmm.. that felt like she kicked both legs out I was not sure until my friend told me she saw her do it. I assume that if she was cranky and if she really wanted me off her back she could have easily thrown me off. What I am wondering is why she bucked ? No one can read a horse's mind but I was wondering if it was my nervousness/bad mood/the tack or if they don't always mean anything by it.Can anyone elaborate on this subject? What can you do if they start to do that in earnest? Hang on ? I got a bit of a fright but the horse was fine for the rest of the lesson.