Ura-Nage is usually used as a counter attack. The key is to be ready and waiting for the attack. Read your partner’s movement, and as they turn in be ready to counter.
How to throw with Ura-Nage
1. Wait for your opponent to attack you with a forward throw like Harai-Goshi or Hane-Goshi.
2. Drop your hips and grab uke around their waist.
3. Pick uke up off the ground using your legs to lift.
4. Lean backwards and twist towards uke as your throw them to the mat.
5. Control the landing!