Grab your longest lens and put it on your camera. If your camera or lens has image stabilizer or vibration reduction, then turn it on. Photograph an object from a long distance, at the longest focal length your lens offers. Keep the ISO low so you rely on your steadiness and the stabilizer. Then bump the ISO up and photograph the same object with better shutter speed. This challenge will help you learn about your limitations with long lengths and shutter speeds as well as the benefits of good exposure.
Share your results and thoughts about this using the hashtag, #handheldchallenge.