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I personally cannot do heavy impact training as it hurts my joints. Initially I feel I have lots energy however this depletes quickly in my particular case.
Yoga, Pilates and walking are brilliant and also very good for the mind (a fantastic coping strategy and good way of life for many). I manage well on a bike and also enjoy a bit of fun in the kids scooters. I also suggest a little bit of gardening! Great exercise!
Do what you can and learn to know your own limits.