I am a 20 year old female with the weight of 96kgs. I started going to the gym 2 months ago and my trainer straightaway put me on squats, crunches and stair climbing along with 20 minutes of treadmill 6 days a week. It all started out fine but it's been a few days that I've developed this pain in my knees and lower back. But it isn't a consistent pain. My knees (especially the right one) hurt when I squat, get up to stand from a sitting position or climb or get off from the stairs. And my back hurts when I bend it for like to pick up something from the floor or even to pick up something which requires a bit of bending from my back, when I get up from a sitting position and when I stretch it. My right knee hurts more than my left one and now it's just creating difficulty in Working out. Please guide me a bit. Thanks.