What one does with one's body here is a metonym for the purpose of doing so. The Israelites would commonly pray while standing with their hands raised and spread out at their sides. Alternate translation: "pray to you with my hands lifted up at my sides" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The psalmist speaks of wanting to be with God as if he were in a parched land and he also was about to die of thirst. Alternate translation: "I want to be with you the way a person in a parched land who is very thirsty wants water" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The psalmist desires to know Yahweh. The intensity of his desire to know Yahweh is like one who is very thirsty. Alternate translation: "I long for you" (See: [[rc://en/ta/man/translate/figs-metaphor]])