I've often tried to find solutions for using a mouse or pointing device on either side of a keyboard. This new OysterMouse appears to solve the problem . It has both a wired or wireless version. I have yet to try it out and would be interested in reader comments.
This comprehensive book covers what you need to know about exercising and minimizing the possibility of injury during exercising and related sports activities. The authors are very thorough covering the finer points of the form needed to safely do exercises while gaining the most benefit. The illustrations help understand the need to control balance and torque for each exercise.
The book covers three levels of exercise difficulty and has a section in the back on exercises for each region of the body.
I found the discussion on the finer points of a situp to be very helpful.
The subtle art of sitting and standing on the View with Dr. Kelly Starrett