What are your best tips of how to deal with a difficult co-worker?

Just try your best to get along with them. Starting drama will only make things worse, remember that she/he’s your coworker not your friend. You’re at work to do your job. With that said just play nice, take a deep breath and focus on the main task at hand.

Push up require upper body strength, so weight-training exercises such as shoulder press, curl ups and dead lifts would improve your ability to perform proper push ups.