Ideally, you will feel the back of your legs and seat working as you push and pull the carriage out and in. Not allowing your upper body to change.
Knee stretches on the Pilates Reformer: -round back -arched back
Knee Stretches Round Back on the Reformer
Video 24 Reformer Reverse knee stretches series
Reformer Pilates Movements - Genesis Health + Fitness
Exercises for Knee Pain to Get Your Clients Mobile Again
Reformer Salute
Knee Stretches Knees Off on the Reformer
13)-Knee-Stretches-Round - Exercícios de Pilates no Reformer
Reformer Pilates Exercise for Back Care
Knee Stretches: Single Leg Knees Off on the Reformer
10 Essential Stretches for the Knee
Reformer training: stomach massage – round back - AthensTrainers®