Running a half marathon is far from impossible for most healthy individuals, but does require careful training. Luckily, Hal Higdon did a great job of laying out programs well suited for novice, intermediate, and advanced runners.
For the full explanation of the programs, please read the available resources at Hal Higdon’s site.
To save the spreadsheets to your phone, just scroll down and find the running experience level that suits you.
Novice Program
Half Marathon Training Program Spreadsheet (Novice)
Intermediate Program
Half Marathon Training Program Spreadsheet (Intermediate)