Good morning, I am 52 years old and getting back into the swing of things and looking for ideas on building a good base from now through the spring, here in the Northern Hemisphere. I have read to some extent about MAF method which would have me riding at 120 BPM which seems very low, but appears you need to put in a lot of time at this intensity. In addition, i did an FTP test and would really like to get stronger than the 165 I am at currently. There are others that suggest that is appropriate if you have a great deal of time, and if not, you should use intervals at higher intensity to maximize the use of your time. Any suggestions from people that have experience would be appreciated. Cheers!