Yes, repeatability and time in zone are key parts of progression levels, and there are limits as to how many intervals you can squeeze into a short time.
Certainly TR do a good job of making short workouts challenging by trimming to warmup/cooldown, slightly increasing intensity and shortening recovery intervals. When it comes to anaerobic, VO2Max and threshold workouts, you can still achieve pretty challenging progression levels in 30-45 minutes. When it comes to endurance, tempo or sweetspot, you just can’t achieve the same challenge in 30 minutes as you can in 60 or 90 minutes.
But even a 30 minute endurance workout is better than sitting on the couch. DOn’t let the perfect be the enemy of the good.
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