Sparked by Andrew Marr's interview with BBC about Indoor Rowing, British Rowing has posted some useful advice for those who row indoors.
It's important to remember that sometimes you may consider yourself healthy, but the numbers on the machines don't always match how you feel. I have known many people to join a gym completely unaware that their blood pressure was dangerously high. This is not just as a result of fitness, but also diet, stress and lifestyle.
If you are starting rowing for the first time, let alone any activity, visit your G.P. for any advice their may offer, especially with regards to your medical background.
See BR's sound advice from the Chairman of the Medical Advisory Panel: