#J, 26 bytes

[:,@,./(0 1$~#)]`(|.@])/.]

ungolfed

[: ,@,./ (0 1 $~ #) ]`(|.@])/. ]

explanation

• (0 1$~#)]`(|.@])/.] Use Key /. to split the input into the even/odd groups: (0 1$~#) creates the group definition, by repeating 0 and 1 cyclically to the length of the input. We use the gerundial form of Key for its main verb ]`(|.@]), which applies the identity to the first group and reverses the second group: (|.@]).
• Now that we have the two groups, the odd one reversed, we just zip them together and flatten: ,@,./

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J, 26 bytes

[:,@,./(0 1$~#)]`(|.@])/.]

ungolfed

[: ,@,./ (0 1 $~ #) ]`(|.@])/. ]

explanation

• (0 1$~#)]`(|.@])/.] Use Key /. to split the input into the even/odd groups: (0 1$~#) creates the group definition, by repeating 0 and 1 cyclically to the length of the input. We use the gerundial form of Key for its main verb ]`(|.@]), which applies the identity to the first group and reverses the second group: (|.@]).
• Now that we have the two groups, the odd one reversed, we just zip them together and flatten: ,@,./

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#J, 26 bytes

[:,@,./(0 1$~#)]`(|.@])/.]

Try it online!

#J, 26 bytes

[:,@,./(0 1$~#)]`(|.@])/.]

ungolfed

[: ,@,./ (0 1 $~ #) ]`(|.@])/. ]

explanation

• (0 1$~#)]`(|.@])/.] Use Key /. to split the input into the even/odd groups: (0 1$~#) creates the group definition, by repeating 0 and 1 cyclically to the length of the input. We use the gerundial form of Key for its main verb ]`(|.@]), which applies the identity to the first group and reverses the second group: (|.@]).
• Now that we have the two groups, the odd one reversed, we just zip them together and flatten: ,@,./

Try it online!