I've been lifting weights at home for over 1 and a half years now, i do it by watching youtube videos. i keep on increasing weights too after some weeks. at the moment i use a 5 kg ankle weight each leg and resistance band and also use a 7.5 kg dumbbell. I've noticed since the time i've started doing weights, i've been experiencing a variety of different lower body problems, which could be probably owing to the fact that my posture is wrong. At the moment, i feel like my left and right side of tailbone pains and also recently i'm having the right lower abdomen spasms every few hours. Do you think this problem could be due to lifting weights wrong? I do an exercise where i lift 7.5 kg dumbbell in the form of side leg raises lying down.