I just wanted to let you know how pleased I am with the dry fire pro. I am 76 years old and have been wanting to get back into archery after about 60 years out of it. I went into the Marine corps in 1956. When I left 8 ½ years later, I went to work to support my family and to college. There was no time for much else. I outfitted the Dry Fire Pro with a sight and the 2.5 lb weight as you suggested in your video. I am progressing rapidly. my arm strength is increasing, my posture has improved, and i am getting better at keeping the sight on the target . I thank you for your efforts to develop and market this most excellent product.