The more Body Jets in each shower system result in lower flow and pressure from each jet.
Tested with a 1/2 inch Thermostatic Shower Mixer at 3 bar producing a flow of 13.6 Litres per minute:
3 body jets gave a 1500 mm length straight hard spray.
4 body jets gave a 900 mm length straight hard spray.
6 body jets gave a 600 mm length straight but less hard spray.
Body Jets should be piped so the flow of water is shared equally between them.
See drawings in the picture gallery showing "Pressure balancing loop designs for body jets".