Training loading fitness curves for the year to date. March was spent overseas (red dots) so minimal structured training. On return eased back in plus had some sinusitis and sciatica issues. Then got in a few weeks of solid training (riding and indoor rowing). But then a near week of atrial fibrillation (yellow dots) limited training but back into training again for last couple of weeks. And in last 6 weeks VO2max estimate has increased by 3. Hopefully can continue the consistent training.
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Getting pretty serious here.
Any goals with this fitness? Racing?
Way past my prime in my mid sixties 
Just like to keep fit and like looking at numbers. Only goal is to get VO2max of 50, and be fit enough to keep up with 6 year old grandson.
What sort of stuff are you doing to push that VO2 max?
My VO2max efforts are almost entirely done on the indoor rower. Maximum length of workout is 30 minutes. Concept2 has Workout of the Day which is usually some form of interval training.
Not a fan of indoor workouts, and have given up on indoor cycling. Outdoor cycling is mostly zone 2 efforts and is more about just enjoying the ride. But do add in some harder efforts.
To track fitness, I use intervals.icu. It connects to my Garmin and Concept2 web accounts. Lots of analysis stuff. It also connects to Strava and many others (Polar, Wahoo, Zwift, …). Highly recommended if you like that kind of thing.