I'm an adult learned swimmer and did triathlon in my 40s, 2020 Brought a series of life changes along with covid and knocked out my triathlon for now. At 53 I have issues with my knees and may never get back to that. I subscribe to the weekly workouts but am nowhere near that level - I do not have 1 1/2 hours to do any exercise due to work and family commitments. I'm looking for a good 30-45 minute workout plan for two morning swims, with a longer one possible (but keep to 45-60) on Saturday. It's frustrating that this website has three beginner workouts and then, in my opinion, absolutely nothing intermediate. Any suggestions are appreciated.