Table 1. Instructions.

Single-joint
	IF	Attempt to produce as much force as you possibly can while focusing on contracting your arm muscles as hard and as fast as you can
	EF	Attempt to produce as much force as you possibly can while focusing on pulling the strap as hard and as fast as you can
	N	Attempt to produce as much force as you possibly can
	M	Attempt to produce as much force as you possibly can while looking at yourself in the mirror
Multi-joint
	IF	Attempt to jump as high as you can while focusing on contracting your leg muscles as hard and as fast as you can
	EF	Attempt to jump as high as you can while focusing on pushing of the ground as hard and as fast as you can
	N	Attempt to jump as high as you can
	M	Attempt to jump as high as you can while looking at yourself in the mirror

The instructions provided to each participant in the single and multi-joint experiments for the Internal Focus (IF), External Focus (EF), Neutral (N) and Mirror (M) investigation conditions.