It's a bit of an 'up & down course' with some drags
1. From the start, up to (& around) Sandal Castle
2. Up to 'Gallows Hill', on Chevet Lane
3. Oakenshaw Lane, after the section along the (disused) Barnsley Canal is a bit up & down'
4. Personally, I think the worst section for a lot of people (on lap 2) will be from the bottom of Heath Common, up Doncaster Road, past the Rugby ground, towards the city. Then, there's the short climb up the bridge, over the 'Cut' at Fall Ings