I agree with how you are describing certain sensations; however, spasticity for me is when my muscles contract in very painful cramping like a Charlie Horse but not only in the calf muscle. It can be anywhere. I've had it in my shoulders, my hands, from my butt to my ankle, and in my feet (thankfully, not all at the same time!)The cramping happens unannounced but for me is worse at night. It will wake me from a deep sleep. I can't put full weight on my legs but I have to move. Often I have to just get in a hot shower. Others find ice works better for them. I take 2 different muscle relaxers, an antiseizure medication and a tricyclic to help control it. If I relax the spasticity too much, the muscles in my legs can't support me. It is a balancing act but usually taking extra meds to ease the cramp wins out.