Toddler not Interested in learning/books

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Hello Moms. My toddler (21 months) is currently in speech therapy and his therapist gives me a chart with activities to do with him. He is not interested in anything. One thing on the chart was to play with slime for sensory. He would rather play with his toys. I try to read him books. He’s only interested for the first 2 mins then wants to play and walk around. Any advice on how to keep toddlers focused? Any other moms experiencing the same issue? I’m trying not to get so frustrated because I have to remember that he’s still really young and doesn’t understand why I’m trying to make him do certain things.