Here's a few small things I'm going to add to my routine.
1. Eat more protein: As a vegetarian I always have to make sure I have enough in my diet, but in order to build muscle I really have to ump the ante.
Dr. Oz has these protein shakes I find pretty good. Adding one a day will certainly help.
3 cups spinach
2 cups ice
2 tbsp of peanut butter
1 scoop vanilla protein powder
3/4 cup of unsweetened almond milk
Mix in a blender.
2. Add some weight: My exercise routine leans towards cardio. It's measurable. I set my watch for 30 minutes, and in 30 minutes I'm done. Therefore, I'm structuring a strength training routine into my week.
Slim Sanity has a bunch of useful information.
Here are a couple quickies: