Recently I have joined several short story/flash fiction contests. Though the monetary gain is a great motivator, the break from my manuscript for my novel is a breath of fresh air. The deadlines and the prompts are great exercises. It has provided me with feedback, it has shown me where my strengths and are and what my weakness are. It is not unlike going to the gym to work on my weak areas with a "program" to follow. If you want to sharpen your writing skills I highly recommend join a group...