Sometimes, I think we are all tempted to rush through our strength training. Try slowing down to work your muscles even harder. Try up for 4 and down for 4, or even an 8 count. The slower count helps you to eliminate momentum so that your muscles have to do all the work on their own. You might try even a slightly higher weight at this pace. Give it a try and you will definitely feel the difference. Have you tried slower paced strength training? If so, leave a comment on what you think.