The World Health Organisation recommends that adults aged 65 years and above should engage in at least 150 minutes of moderate-intensity physical activity or 75 minutes of vigorous physical activity each week. Most national organisations for health offer similar guidance and set out the FITT principle.
Set a goal
Having a goal in mind and working towards it can be also very helpful. As you begin training spend time thinking about what motivates you and what you want to achieve. Once you have identified an area important to you, try to set some SMART goals (specific, measurable, achievable, relevant and timed). These goals can be short-term and long-term, including things you want to work towards. They don't need to be about fitness but what fitness means to you e.g. playing with your grandchildren, or getting out with friends or family.
For more goal setting tips, download the Fresubin exercise book.