What he said is exactly right and part of what they try to get you to do in CBT.
As you know depression causes you to lose interest and find previously enjoyable activities not good. One of the best way to help is to force yourself to do one of these, even if you don't enjoy it, even if you don't feel like it. It is apparently very beneficial because you get up, get your brain/body moving which is good for depression.

You don't go out and do heaps of things. Start with one thing you used to enjoy doing - walking, gardening etc and just decide that today I am going to do this for 20minutes even if I don't feel like it and feel like crap - that is a doable target, and then build it up and try other things, but just short periods.

Because in the end, our docs, Ts can't make us better, we have to do it ourselves, the meds are an aid but can't do it all and anything that is worth doing hurts and is hard