Low weight arm exercises. Use 5-8lb weights, do 20x reps and increase at your own weight.
Your achy knees while running may be due to weak hips. Strengthen the hips and running may be enjoyable again...not too mention much smaller hips:) - Good to keep tucked away in case I need it.
10-Minute Full-Body Crossfit Workout- try in the mornings??
"If you want pancake-flat, carved-up lower abs and a razor-sharp V-cut, consider The Lower Abs Trifecta your little secret weapon. Comprised of 3 different ab exercises back-to-back, it'll absolutely demolish your lower abs and leave you sore for days. That's exactly what we want -- hyper accelerated growth."