Exp:			Experiment	
				1 = Experiment 1
				2 = Experiment 2
Focus			Focus group	
				0 = internal
				1 = external
MD_session1_f	Mean distance in mm during session 1 for the front target point	
MD_session1_b	Mean distance in mm during session 1 for the back target point	
MD_session2_f	Mean distance in mm during session 2 for the front target point	
MD_session2_b	Mean distance in mm during session 2 for the back target point	
MD_session3_f	Mean distance in mm during session 3 for the front target point	
MD_session3_b	Mean distance in mm during session 3 for the back target point	
MD_session1		Mean distance in mm during session 1	
MD_session2		Mean distance in mm during session 2	
MD_practice		Mean distance in mm during practice (session 1 and session 2)	
MD_retention	Mean distance in mm during retention (session 3)	
Inv_practice	Number of invalid trials during practice	
Inv_retention	Number of invalid trials during retention	
Diff1			Difference scores for day 1 (manipulation check)	
Diff2			Difference scores for day 2 (manipulation check)	
Diff3			Difference scores for day 3 (manipulation check)	
Age				Age in years	
Gender			Gender	
				0 = female
				1 = male
Expertise		Expertise in balance sports	
				1 = no expertise
				2 = tried out more than four
				3 = at least one used to practise intensively
				4 = at least one is now being practised intensively