See the video
In the video it is clear that the jet takes off and lands with all these 3 things "open/stretching out" (so it seems to fly just like that - not retracting them).
Here is Wiki on that model.
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1$\begingroup$ Related: What is the purpose of the “Mirror-Thing” over the Mig-29 Cockpit? $\endgroup$– BianfableAug 28 '19 at 8:42
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The upper thing is a mirror for the WSO's (rear seater's) periscope. It gives that position some forward visibility when extended. Without it, I doubt that position could see the runway. There are several other Russian aircraft with periscopes.
The lower ones are speedbrakes.
Looking at the underside of the vehicle my speculation is that they interfere with the landing gear retraction, so are extended until that point. But if that's true, do they have to extend when the gear come down for landing? No idea. I can't think of another good reason for them to be open on takeoff.
A comment from ymb1 showed a very nice image of the doors/speedbrakes on wikimedia 
This shows that they need to be extended until the gear is retracted.
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1$\begingroup$ But then why are the air brakes extended for takeoff? I did not watch the video, but the questions says takes off and lands with all these 3 things "open/stretching out". $\endgroup$ Aug 28 '19 at 9:33
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6$\begingroup$ Mystery solved (I think): the air brakes double as landing gear doors (which would confirm your speculation). $\endgroup$– ymb1Aug 28 '19 at 10:09
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1$\begingroup$ Yes, or rather, the landing gear doors double as airbrakes. Because, why not? The extra drag at takeoff is insignificant for this aircraft. $\endgroup$– ZeusAug 29 '19 at 1:07