On some desktop keyboards (like mine) it's also possible to press each control key with the metacarpal phalangeal joint on the respective hand- that's the bit of bone and sinew at the base of the pinky finger [1]. Or, you can always move your palm to the side and hit CTRL with your thumb, but that means your fingers must leavet he home row.

I often use my thumb to press Ctrl+E/D to scroll up/down in vim.

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[1] https://en.wikipedia.org/wiki/Metacarpal_bones#/media/File:M...