Chair-supported standing Pilates

I'm a woman over 65 and new to exercise. Write me a 25-minute standing Pilates routine that uses a sturdy chair (high-backed, no wheels) for light hand support throughout, so I never have to get down on the floor. I want to focus on posture and core control. Please structure it as: 1) Warm-up (5 min): gentle standing movements like shoulder rolls, neck turns, and slow heel raises holding the chair. Tell me how many of each and a comfortable pace. 2) Main set (about 15 min): 6-8 standing Pilates exercises with one hand on the chair when needed — e.g. standing pelvic tilts, standing leg lifts to the side and back, calf raises, gentle spine articulation (roll-down), standing thigh-stretch, and a posture/core hold. For each, give the number of reps OR a hold time in seconds, how many sets, and rest in seconds between exercises (roughly 30 seconds). Cue me to breathe and engage my deep abdominals. 3) Cool-down (5 min): slow stretches I can do standing with hold times of 20-30 seconds each. Keep all movement low-impact and pain-free. Tell me to stop any move that causes sharp pain or dizziness, and to keep the chair within reach the whole time.