In Lords Mobile Weight Training I research increases the amount of resources your troops can carry. It is found in the economics tree.
There are 10 levels in total and once maxed you will have increased your army capacity by 75%. You need to have researched Vault Management 1 before you can unlock weight training.
The table below has the resource cost and time to upgrade each level. It also shows the might and rewards granted. You can find out your own research time by using our research calculator.
Weight Training I Research Requirements
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