Drink plenty of fluids!! If leg cramps - take a teaspoon of yellow mustard- french's mustard. It will relieve leg cramps.
Thanks - not exercising - he works outside doing lawn care - had to be hospitalized once so trying to prevent that again - but got dehydrated again
Low electrolytes, like potassium, because of dehydration, is probably causing the pain and tightness in the calves (based on the limited information you provided)
--Hydrate very well with spring water before any activities and one hour away from meals. Do not drink distilled water!
--Consume mineral and nutrient dense foods. If not adequate minerals in your food/drink intake, you may need mineral supplements
-- Before you exercise, even when you go for a brisk walk- make sure you warm up and stretch your muscles and at the end cool down and stretch again.
Love & Light
Niko