Welcome Hattrick manager. If you login on HT-Tools, you will have full access on the options of the website.

Choose the first or the second option in base of what you want to use on the calculations

Training intensity before lowering
Team spirit before lowering
Training intensity after lowering
Team spirit after lowering
Training Intensity Trick
Info: With this tool it is possible to calculate how much the team spirit rises when you lower your training intensity or how much your training intensity should be reduced so that it has the desired effect on the team spirit. This tool is in beta version and it may not be accurate enough. The original developer of this tool is GM-Noortje.

The lowering should be done before the update on thursday morning * to experience the effect in the same week. Beside that lowering your training intensity could give you longterm negative effects on your players form. Also your team spirit will the next thursday drop again when you raise your training intensity again. *in fact, it's before the last daily update before the training update, some countries have it on wednesday and others on Friday.