Greg\'s marathon trainer wrote:
Lets look at the numbers:
Jacobs 10k PR is from 2019 27:54 that indicates a 1:01:34 Half Marathon.
5000m PR is from 2021 12:48:45 indicates a 58:58 for the Half Marathon.
Jakob is a specialist on the short stuff like 1500 and 3000 meters on track. That's very far away from Half Marathon distance on roads. Sorry 56 minutes will not happen.
First of all they’re discussing an aided HM course that might cut 60-90 seconds. Second, Jakob is hardly a 1500/3000 specialist as he’s won back to back 5000m golds. It is a bit of an unknown how well he’d perform nowadays at 10K/HM. But 27:54 from 2019 is not near his current level and 12:48 also seems dated.