10 Reasons Why Your Workout Isn’t Working 5. You’re not working hard enough. You’ve been using those 5lb weights for more than 6 months now. Your body will just get use to it. Increase weights or intensity of your workout at least every 8 to 10 weeks. Image source: returnofkings.com Previous 1 2 3 4 5 6 7 8 9 10Next