Are these post prandrial levels normal?

Your levels are absolutely normal. However when you start working out like Rocky again make sure you have an energetic drink with sugar nearby and when you feel the telltale symptoms you start drinking this SLOWLY. Not gulping it down. In 5 to 10 minutes you will be OK. Hypoglycemic episodes are to be avoided. One of these days you will wake up in the ER from a hypoglycemic shock.