Last week ABC TV (Australia) ran a program on their Catalyst series of science programs revealing how we can all "improve our healthspan by making simple changes to the way we live our lives" (watch or download the program here).

The show featured retired newsreader Ian Henderson on a quest to find "the secrets of ageing healthily" - a subject close to my heart. I must say that as someone well-versed in the "secrets" I heard only one new one, which I'll explore below. But it is fantastic to see these ideas put out into the mainstream and made more accessible to everyone. I enjoyed his discoveries and his enthusiasm, and the more of these kind of practical education shows the better.

I'll summarise his key findings here, accompanied by my own insights in also discovering and applying these things over the last 20 years. That might help fast-track you to picking up on those which appeal to you most and also those which give you the most bang for your exercise buck.

What I knew about my eldest brother (Harry) was relatively little. Only that he'd had a brutal upbringing - at the hands of  both our mother and our father. He'd learnt to box at an early age at the Botany Boys Club and this catalyzed in him an intensely deep-seated sense of manhood.

He went on to ride motorbikes before he had a license, knocked out two of my father's front teeth in one of their confrontations, and had been stabbed in the back by a large kitchen knife thrown at him by my mother as he ran from her rage.

He left home before I was born, was in trouble with the law, spent time in Pentridge Prison. and had fled to work in New Britain (Papua New Guinea) for 15 years in about 1960 (shortly after Mum died - after spending time in a psychiatric institution).

I knew that Harry had been living in Darwin for decades - 3,200km from me in Melbourne as the crow flies and 40 hours by road. When my phone rang 4 weeks ago with a caller id of "Darwin" I wondered what was coming.

The new exercise and physical activity guidelines issued by the US federal government’s Office of Disease Prevention and Health Promotion are better tailored for age and ability. Importantly, they also now take into consideration the intensity of activity, and not just a blanket generalisation of "moderate activity". This is the biggest difference which will most change the potential impact of the new guidelines as compared to the old.

This move to recognise intensity is a very useful change. Previously the recommendations focused people on spending a certain amount of time exercising, including the caveat that spending less than 10 minutes at any one time was not worthwhile. The new guidelines base your dose of physical activity on relative intensity: how much effort a given exercise takes compared with your capacity for exercise. ​They also recognise that short bouts of exercise can be useful - "what really is important is the total amount of physical activity you accumulate during the day and the week".

It's that time of year again where new gym memberships soar, ambitions are high, and lofty fitness goals are set. As we all know, the New Year's fitness see-saw usually ends up with an unhappy ending, unfortunately. Here are my five suggestions to help you create the most sustainable start for your New Year's fitness program.

Trim your ambition and start with much less than you think you can accomplish.

For a start don’t plan an hours session at the gym every day of the week, and don't plan 5:30am classes if you normally don’t even get up until 6:30am. It's better to add more later than to start and then try to subtract. Most people don't end up subtracting successfully - they stop altogether. You only need start with 3 gym sessions a week, make one focused on cardio e.g. a spin class, one on strength e.g. a Bodypump class, and one on functional exercise e.g. Pilates or Body Balance.

​Classes are the easiest way to get a pattern established and you don’t have to think about what to do next.