"improving their mood" is correct and usable in written English.
You can use it in any sentence where you want to describe a situation in which someone's mood is being improved. For example: "The children were delighted when the clown arrived, improving their mood significantly."
The intervention really changed their day-to-day functions and improved their mood.
Some find light boxes – which omit rays at least 10 times stronger than ordinary lighting – help to improve their mood.
A team of researchers at London's Great Ormond Street hospital have carried out research which shows that playing music to children can reduce pain and improve their mood.
Many people are sure that exercise improves their mood, and studies have suggested that exercise is almost as effective as antidepressants in relieving symptoms of depression.
5)"You shouldn't exercise during your period" Some women find that exercise before and during a period can reduce cramps and improve their mood.
He helped the Chinese scientists develop an "enrichment program" to spark the pandas' interest in their environment, keep their minds occupied, improve their mood and, it was hoped, boost their interest in procreation.
That a third trophy has slipped away, following on from the Community Shield and the European Super Cup, not to mention their elimination from the Champions League at the group stage, will do little to improve their mood.
In one study involving information technology specialists, she found that those who listened to music completed their tasks more quickly and came up with better ideas than those who didn't, because the music improved their mood.
Researchers used a seven-item questionnaire to determine whether people felt a need to spend money, whether they were aware that their spending behavior was aberrant, whether they bought things to improve their mood and whether their buying habits had led to financial problems.
