I have been there! What you need is assistant coaches. I have used former athletes (alumni) as many of my assistant coaches over the years. And use the buddy system. Have your advanced athletes assist you with the technique. This way you don't spread yourself too thin. You can't be with everyone all the time.
You did the right thing to paint circles on the ground in order to make things go much faster. However, you cannot do both the shot put and discus in one day. The exception is the day before a meet when you simulate the meet day. The first responsibility is technique. Practice shot put on one day with strength training and the next day practice discus with strength training. Rotate practices for now until you have a coaching staff.
You might have to spend more than 2 hours practicing.
I had the numbers and spent 3 to 4 hours getting in technique, plyometrics and strength training. I also included Saturdays to get more time in. The successful coaches are putting in 3 to 4 hours of training and they are the last to leave. In a short time you will have your warriors who are willing to put in the extra time and effort. The others will be weeded out which will make your coaching easier.
If you do not get any assistants you have to work out a system. This is what coaching is all about. It is a learning experience. You should spend more time with the athletes that are talented and consistent. Give these athletes a lot of attention. Every time they recover their implements, put them in the front of the line so that they get more throws in.
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