I agree with Karin. Create your own tracking tool. Excel is a great resource. Or just create a format that works for you in giving the tracking data that you want to follow up on. There aren’t that many variables. Just be sure that you create a way to objectively observe changes over time.
I use the Training Notebook for client assessments and tracking. After you do the first one, you can add on to the assessment page (and just add the measurements you would like).
It is somewhat limited, and I’m not sure if it will put them into a chart as you would like, though.
Otherwise, you could just make your own as the others have already mentioned.
I’d love to hear what you think about http://www.gympro.com – we’re just about to release an iphone and android app too.
My name is Leighton Sjoren, and I am the creator of Personal Trainer’s Tool. I created the app (for iPhone) to do pretty much exactly what you’re describing. Check it out at http://www.techknowsfit.com/apps/personal-trainers-tool/
Hope its a help to you!