Yup. A smaller woman can throw a larger man...
Here is Heather in Colorado in 1999.
"Aikido" can be translated as "way of combining forces." It is a martial art designed for self defense ("Shinju" means self defense and "dojo" means school).
We learn how to blend with the force of an attack, and a small person really can learn to defend from a larger attacker. Aikido relies on movement rather than speed or strength - it's good for all kinds of students.
Aikido is great for self-defense and for developing self-confidence in movement and even in falling. It's fun to practice and it attracts an interesting variety of people.