Hey guys. I work train bjj 3 times a week and go to school. Due to schedule I can only attend one kickboxing class a month. I don't have money for additional gyms. I have a heavybag stand but need a bag. Thing is, I feel like doing unsupervised bag work would drill bad habits in. Some people say its easy to get the technique down and drilling on the heavybag would build my speed and power. Any advice?