Simplify the following text for a Grade 11 native English-speaking person.
Original: This requires very little physical strength , as the aikidÅ ka ( aikido practitioner ) `` leads '' the attacker 's momentum using entering and turning movements .
Simplified: This takes very little physical strength , as the aikidÅ ka ( person who does aikido ) `` leads '' the attacker 's momentum using stepping and turning movements .