Thomas Kurz has a quick post on “How to Prevent Insufficient Recovery in High-Intensity Training “
6. To find out when it is safe to do intense exercises (and for a sore calf, jogging and running are intense resistance exercises), press deep into the muscles to be exercised. You can poke them with your finger, you can roll on a hard roller, or you can get a deep-tissue massage. If you feel tenderness, then those muscles are not recovered sufficiently from the previous work. Change the subject of the workout. If you feel no tenderness in the muscles you plan to load, then it should be safe to do so. (Now, do you really know which muscles you are significantly loading in a given exercise? See point 8.)
