Stop and get medical help
If you get chest pain or pressure, feel faint or dizzy, are unusually breathless, or your heart races or beats irregularly during exercise, as our plans advise. The American Heart Association says these need immediate medical evaluation.
Source 33
Call 999 (911 in the US)
For chest pain that doesn't go away, feels tight or like squeezing, or spreads to your arms, neck, jaw, stomach or back, or comes with sweating, feeling sick, light-headedness or breathlessness; severe difficulty breathing; someone who faints while exercising; palpitations that don't go away, or come with chest pain, shortness of breath or feeling faint; or a headache that starts suddenly and is extremely painful. Don't drive yourself to A&E.
Sources 34, 35, 36, 37, 38, 39, 40
Check before you start
If you haven't exercised for some time or have a medical condition, speak to your GP first, as the NHS advises. Get advice before hard intervals or jumping if your blood pressure is uncontrolled, or you have heart disease or chest pain when you're active, a pacemaker or defibrillator, diabetic eye disease, glaucoma, a hernia, recent eye or tummy surgery, or you're pregnant, as our breathing guide lists.
Source 26
After a faint, or dizziness that keeps coming back
See a GP after any faint, and for dizziness that won't go away or keeps coming back.
Sources 37, 41
A turned ankle, a twisted knee or a fall
Call 999 or go to A&E if you heard a crack, the joint has changed shape or points at an odd angle, it's numb or tingling, or the skin looks blue or grey or feels cold. Get help from NHS 111 if it's very painful or swollen, or you can't put weight on it or walk more than a few steps. Call 999 if someone has fallen and may have injured their head, back, neck or hip, or can't get up.
Sources 42, 43
Your knee
Get advice from NHS 111 if your knee is very painful, you can't move it or put weight on it, it's badly swollen or has changed shape, or it locks, gives way or clicks painfully. A knee that gives way after a twisting landing needs checking before you jump again. See a GP if knee pain doesn't improve within a few weeks.
Source 44
Heels, Achilles and one sore spot on a bone
After an injury, contact NHS 111 for severe heel pain, a snap, grinding or popping noise at the time, or if you can't walk, walk on your tiptoes or walk up stairs. Pain in one spot on a bone that's worse with jumping and tender to press can be a stress fracture: stop jumping and see a GP, as our stress fracture guide says.
Source 45
A sudden pain in the groin
A sharp pain in the groin or inner thigh during a push-off may be a strain: stop, and follow our groin strain guide. Get help from NHS 111 if it's very painful or you can't walk more than a few steps.
Source 42
Leaking, heaviness or a bulge
Leaking is a reason to change the exercise, not to stop exercising: see a GP or pelvic health physiotherapist. See a GP for a feeling of heaviness or pressure in your lower tummy or vagina, or a bulge or lump in or coming out of your vagina, which can be a prolapse.
Sources 29, 46