Match the response to the situation
If tightness follows a long spell at your desk, change the task or position first. Try a short walk or an easy movement in a comfortable range. If it followed a fresh injury with swelling, do not assume a heat session is the right next step.
Use warmth as comfort
For suitable minor aches, a covered heat pack may feel soothing. Keep it gently warm, check the skin and follow the product instructions. Stop if symptoms worsen; do not apply it over numb or damaged skin or with poor circulation.
Hospital guidance describes these precautions for heat packs. It is not a dosing guide for robotic equipment.
Look beyond the sensation
“Tight” is a description, not proof that a muscle needs stronger pressure. Seek healthcare advice if symptoms persist, worsen, limit normal movement or include numbness or weakness. An operator should not use extra heat or pressure to push through pain.