Factors that affect heart rate
Drug use
caffeine
sugar
nicotine
medication
recreational drugs
setting
temperature
music
situations
state of emotion
humidity (hot, cold, warm)
genre
sleep/motivation
physical
exercise
running/sprinting
skipping
walking
working out
cardio
squats
weights
personal
emotional state
weight
age
mental health
trauma
emotions
amount of sleep/motivation
joy
excitement
shock
anger
fear
nutrition and dehydration (insufficient/sufficient)
standing up
stair machine
running
biking