Public Health Wales have developed some simple guides for strength and balance exercises which can be done at home, using kitchen counters and dining chairs.
These are based on the recommendations from the Chartered Society of Physiotherapists and NHS England. They are designed to help people who are currently finding it difficult to carry out much activity but would like to work on their strength and balance.
Stay Active at Home - Sitting Exercises (English)
Stay Active at Home - Standing Exercises (English)
Stay Active at Home - Sitting Exercises (Welsh)
Stay Active at Home - Standing Exercises (Welsh)
If you are looking to do something more active, Elderfit have a members page on their website where they post weekly workouts and Move It or Lose It have also got some good tips on exercise for older adults and a 'Cuppa Routine' which is a strength and balance exercise that can be done in the time it takes to make a cup of tea.
https://elderfit.co.uk/
https://www.moveitorloseit.co.uk/
https://www.moveitorloseit.co.uk/time-for-a-cuppa/