I am 67, active, play tennis 2 or3 times a week. in the past 6 months to year, i have increasing lower leg (calf, etc.) pain during and after exercise. i don't feel like i am walking with good form.

? PVD: Calf pain that occurs with activity could result from peripheral vascular disease. Of course, other causes are possible but i would discuss this with your doctor.

Tight calf: Most likely you have tight calf muscles- very common, need to do stretching exercises- see a physical therapist to be taught what to do, could be achilles tendonitis or a partial tear of the achilles tendon- that needs to be checked by a pod. Or md.