What activity is included in Carol Ann's warm-up that helps participants to increase mobility in the water?

The activity that enhances mobility in the water is wide steps across the pool. This exercise involves lateral movement which can effectively engage the hip joints, helping to improve range of motion and flexibility. By stepping wide, participants stretch their muscles and joints in various directions, promoting coordination and balance. This type of movement mimics natural walking patterns but in a way that emphasizes wider leg placements and progressive stretching, making it particularly beneficial for warm-ups in aquatics.

The other activities listed do offer their own benefits, such as calf raises which concentrate primarily on strengthening the lower legs, and leg circles that can enhance joint mobility in a more isolated manner. Pulsing twists are also useful for core engagement and spinal flexibility. However, wide steps across the pool particularly focus on increasing overall mobility throughout the legs and hips, making it an ideal choice for a comprehensive warm-up.