You can try doing microworkouts throughout the day. For example: 1. I start the day with one set each of jumping jacks and ab crunches. You can also add in pus

You can try doing microworkouts throughout the day. For example: 1. I start the day with one set each of jumping jacks and ab crunches. You can also add in pushups and/or pull ups (if you have a bar). 2. I have resistance bands of various strength levels. Over the day I try to get in 100 reps each for biceps, triceps and shoulders. Usually I try to get a couple of sets in just before or after a meal. I wouldn't say I'm in the best shape of my life, but this routine has improved my upper body strength at the very least.