This is the 6181st most frequent Russian word.
телу
"Телу" means "to the body" or "for the body" in English.
Here, 'телу' is also in the dative case, indicating to what or to whom the attention should be paid.
Мы должны уделить внимание своему телу.
We must pay attention to our body.
In this sentence, 'телу' is in the dative case, describing the surface across which the goosebumps are felt.
По телу пробежали мурашки.
Goosebumps ran across the body.
The word 'телу' is in the dative case here, used as an indirect object to which the changes pertain.