Why did my boyfriend text me this after I worked out?

Him: Had dinner with the neighbor and her friend
Me: Nice. I am jogging
Him: Good girl! Well done
Me: *sends him a pic of my jogging distance* Sends him a 🥰
Him: *2 hours later* Just stay consistent. The habit is more important than the actual pace or distance

Why would he praise me for working out and then criticize my workout routine after I send him a pic of my distance? Apart from this, he took 2 hours to respond. He usually calls me on the phone before he sleeps or texts me a sweet goodnight message. Instead he told me to "stay consistent"
Why did my boyfriend text me this after I worked out?
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