What exercise do help seniors to walk in their 80s?

Ankle Circles
An excellent way to warm up the legs and feet is to perform this exercise. Maintaining balance, stability, and flexibility requires flexible ankles. It is essential to have strong ankles to retain control while walking. Your ankles help you stop and change directions.
As well as keeping us upright, they keep us supported over our center of gravity. Ankle circles can be performed comfortably while seated. It’s a good idea to do ankle circles when sitting for a long time. To do ankle circles, follow these steps:
1. Place yourself upright in a chair.
2. Make sure your left foot is flat on the floor.
3. Draw a circle with your right foot while lifting your right knee.
4. Repeat 20 times.
5. With your right foot, draw a circle in the opposite direction.
6. Repeat 20 times.
7. Repeat the same exercise with your left foot.
If you cannot lift your knee into the air, Consider simply extending your knee out instead of lifting your knee into the air. If you want a more challenging exercise, try standing. Circling your ankles while standing will help improve your balance.

Hip Marching
You will target your hip flexors and thighs with this exercise. This will help you to walk faster and further than before. It also makes it easier for you to pick your feet up to avoid tripping over things. Using ankle weights can add an extra challenge to this exercise.
Your feet should be flat on the ground as you sit in a chair. Gradually lift your left leg as high as you can as you breathe in. Slowly lower yourself back to the ground as you exhale. It would help if you repeated this exercise ten times. Then do the same for your right knee.

Knee Extension
You can use this exercise to rehabilitate your knees and improve your range of motion. Before performing this exercise, you should consult a physical therapist if you have knee injuries. It is vital for balance, standing, and avoiding injuries to have flexible and functional knees. You can use ankle weights weighing between 2 and 5 pounds for an extra challenge in this exercise. Your feet must be flat on the ground as you sit in a chair. As you inhale, your left knee should slowly be straightened in front of your left shoulder. As best you can, tilt your toes towards you.
Keep them there for a minute or two. Slowly put your left foot back on the ground as you exhale. Then repeat ten times. With your right knee, do the same thing.