How many calories do i burn doing sit ups for 20 minutes
0.0 calories are burned doing sit ups for 20 minutes. See on this web page how many calories a man or woman expends doing exercises or activities. Using the calories burned calculator below, you just need to fill some data and get the value of calories burned in Kcal.
Calories burned in 20 minutes
Activity  Calories 

At rest  30 
Bicycling to or from work  159 
Bike riding  159 
Bowling  70 
Breastfeeding  47 
Cleaning house  75 
Climbing  175 
Dancing  182 
Doing elliptical  117 
Doing housework  75 
Doing jumping jacks  187 
Doing nothing  30 
Doing pilates  70 
Doing pullups  187 
Doing pushups  187 
Doing situps  187 
Doing squats  117 
Doing workouts  93 
Doing yoga  70 
Driving  58 
Gardening  89 
Golfing  112 
Hiking  124 
Jogging  163 
Kayaking  117 
Kissing  30 
On treadmill  210 
Painting  105 
Doing kettlebell  187 
Playing tennis  170 
Raking leaves  89 
Rowing  163 
Running  303 
Sitting  30 
Skating  163 
Skiing  210 
Sleeping  22 
Snowboarding  124 
Spinning  70 
Stair climbing  187 
Standing  58 
Swimming  187 
Vacuuming  77 
Walking  82 
Watching tv  23 
Weight lifting  140 
How to calculate calories (burned)
The number of calories you burn while exercising is dependent on: the exercise you do
 your weight
 the time spent doing the activity
By multiplying the body weight in kg by the MET ^{(*)} value and duration of activity, you can estimate the energy expenditure in Kcal specific to a persons body weight. In this example, doing sit ups at a 6 MET value, burns 6 Kcal/kg x body weight/h.
A 70 kg individual doing sit ups for 20 minutes expends the following:
(6 METs x 70 kg body weight) x (20 min/60 min) = 0.0 Kcal.
6 is the value in METs for doing sit ups.
(*) MET  Metabolic equivalent
References:

Compendium of Physical Activities: an update of activity codes and MET intensities
AINSWORTH, BARBARA E.; HASKELL, WILLIAM L.; WHITT, MELICIA C.; IRWIN, MELINDA L.; SWARTZ, ANN M.; STRATH, SCOTT J.; O’BRIEN, WILLIAM L.; BASSETT, DAVID R. JR.; SCHMITZ, KATHRYN H.; EMPLAINCOURT, PATRICIA O.; JACOBS, DAVID R. JR.; LEON, ARTHUR S.  MET Values for 800+ Activities
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