Click here then follow the steps to link your Withings account to Training Peaks.
https://support.withings.com/hc/ja/sections/6216083667217-%E3%83%91%E3%83%BC%E3%83%88%E3%83%8A%E3%83%BC%E3%82%A2%E3%83%97%E3%83%AA
https://support.withings.com/hc/ja/sections/200649378-Tutorials