Eat healthy and do stretches. The best thing a 12 year old to do. You're too young to do anything super serious imo
I think it's A, but I don't really know this stuff that well... Hope it helps! :)
Answer:
As food passes through the GI tract, it mixes with digestive juices, causing large molecules of food to break down into smaller molecules
Explanation:
Warm up 10 minutes
Cool down 10 minutes
Your weightlifting session is based on style of training. If doing hypertrophy type work the 45 minutes to an hour. If you're doing strength training then it can take up to 2 hrs. Hypertrophy being 8-12 rep range with 30 sec to 45 sec rest and strength training being 3-5 reps with anywhere up to 3 to 5 min rest. Or course training could determine the length of warm up and cool down