Hello, everyone. As the title says, I’m looking to do aerobic training, but I am currently dealing with an Achilles injury, which causes some issues with my ability to run. Training aerobic threshold is a new concept that I want to try, so here is my question: can I perform other activities, such as swimming, biking, or rowing, and still be able to build my aerobic threshold. I understand that it may not be as effective as running, but something is better than nothing. Any help or suggestions are appreciated.