Do you need the data real time?
If not, you could use data logging and read them after the event (I assume it's for optimizing how the body is being used etc.)
Color coded elastic Velcro bands could hold them in place on the body for a quick set-up.
With the devices available to Joe Random, you'll need a microcontroller, but if 8 bit (0-255) of data would suffice, each accelerometer could be read by a tiny microcontroller like this:
That would make a very light weight application.