I started with walking. When I needed some new types of exercise, I went with exercise videos. I love the
Collage Video website because they put clips and reviews of their videos on it. Two months ago, for my birthday, I got the Wii with Wii Fit and I now have two games that I use regularly and will probably buy more as I go along.
I've also found it very helpful to have a monthly exercise goal that I keep track of on 3FC (under Support Groups / Chicks Up for a Challenge). I like having a monthly goal of minutes, because it let's me mix up types of exercise. For you, you could set a goal of 150 minutes in July (just 10 minutes a day for the rest of the month). Walk your 10 minutes or more each day. If you're tendonitis is acting up, do 10 mintues of stretches that day. If you miss a day, exercise 20 minutes the next day. You'll be surprised how good it feels to meet your goal at the end of the month. I reward myself for meeting monthly exercise goals by buying a new exercise video or a new game for my Wii.