Wall push-ups are a good way to get more upper-body exercise when you may not have time for floor push-ups, or maybe you're not so great at floor push-ups. They benefit chest, shoulders, arms/triceps, and core muscles. Step back just a little (safely) to "lean into the wall" more, and make the push-ups a bit more challenging. If you need to protect a wall from natural oil from your hands, try wearing non-slip or rubber gloves.
When I spend time on the computer - reading my email, doing my online banking, or checking in with SparkPeople - I always sit on my stability ball rather than use a desk chair. As I'm working, I'm usually bouncing a little or shifting from side to side or front to back, all the time working my core. This is an excellent way to sneak in exercise and make online time more productive. And....I feel a little less guilty about spending time on the computer!
Treat your strength/weight training and the following recovery day as ONE WHOLE UNIT. The act of lifting weights is the challenge, the body's response is actually when progress is made and the muscles get stronger. If you overtrain, you actually can cause damage. So ST, feed your body the proper nutrients (including protein) within the hour afterward, and get enough rest in order to reach your full potential. Sleep is necessary!
Jillian Michaels Yoga Meltdown = awesomeness. An hour of intense yoga using your body as weight. She uses a number of poses, transitions, and reps for a really challenging total body work out. I promise your mind and body will feel accomplished in the morning, and you'll be on your way to a slammin' body!