Movement

My baby boy moves a lot (28+ weeks). I can feel him kick and punch all the time. There's a movement though I can't quite describe and I have NO idea what he's doing when I feel it. It will be close in my ribs and almost feel like he's making little movements,but very unsure with what body part. Anyone else experience "odd" movements that you can't describe? Not sure what else the baby does inside except kick,punch,and flip.