Charity Age UK claims that less than half of over 55s are doing the recommended 2.5 hours of exercise per week with one in eight not doing any exercise at all.
But findings from the same research highlights that three in ten would like to take part in more exercise.
The findings have been published as part of Age UK's Gym Open Day designed to encourage older adults who want to start an exercise regime to pay their local gyms an introductory visit.
Whilst the new research shows many older people are keen walkers (82%) and often undertake activities around the home such as gardening (75%), only 8% currently go to the gym regularly and 8% do aerobic exercise.
However, older people are keen to take part in more exercise and try something new. Over a quarter (27%) said they wanted to try swimming, with 15% mentioning they would be interested in going to the gym, 14% keen to go along to classes such as yoga or Pilates and 12% interested in aerobic exercise. More than one in five (22%) also mentioned that they prefer to exercise in a group where they may or may not know people