Exercise of the Day - Kettlebell Swings
If you do not have a kettlebell or access to a kettlebell like if you are doing this at home, you can use a gallon jug filled with water (that's about 8 lbs) or two gallon jugs if you want to go heavier. It is important to note that this is typically a timed exercise not a rep count exercise, so start with 30 seconds with 30 seconds in between if you are a beginner, if you are fit go for 2 mins with 30 secs between for 5 to 10 sets.
Here is a good video explaining the technique.
Depends on the workout - occasionally we do them for Tabata and it's 8 sets of 20 seconds, on kitchen sink days it's three rounds of 45 seconds with a lot of exercises in between (hence kitchen sink), random days we do them for three minutes for maybe 3-4 rounds (that's the max usually), for a "normal" workout it's a minute, rest 10 seconds, maybe three rounds. I've been doing mostly single arm swings because I'm trying to work on my coordination and getting more comfortable swinging. The longest I've done is five minutes for double arm swings