The centre of mass (COM) from RSCV will be determined and the mean variations in x,y, and z coordinates will be calculated. In addition, the mean and standard deviation of the change in volume of the RSCV will be calculated. The movement of the COM coordinates will be calculated in reference to both the tattoos and the point guards separately. A paired t-test will be used to assess whether there is a statistically significant difference in mean COM movement in reference to the tattoos and centre spots. This will allow us to verify if setup to external skin marks (tattoos and point guards respectively) track the RSCV.