Glossary entry (derived from question below)
English term or phrase:
engaged
Portuguese translation:
Abdômen / core ativado / contraído
English term
Brazil
Experienced and reliable translator
Native in: Portuguese 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English
engaged
So, what does it mean to engage your core? Your core is engaged when all 4 sections of abdominal muscle are braced together and working with the muscles that are connected to your spine to stabilise the torso.
Proposed translations
Brazil
English-Portuguese; Spanish-Portuguese
Native in: Portuguese (Variants: European/Portugal, Brazilian)
Works in: English to Portuguese, Spanish to Portuguese, Italian to Portuguese, and 1 more.
Abdômen / core ativado / contraído
Boa sorte com o trabalho!
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Simone Taylor
24 mins
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| agree |
Clauwolf
2 hrs
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| agree |
Rodrigo Bovino
: abdômen contraído
3 hrs
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| agree |
Ana Flávia Ribeiro
6 hrs
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Brazil
IT Specialist • M.A. in Linguistics
Native in: Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Spanish to Portuguese, Portuguese to English, and 1 more.
firme
Entendo que significa manter a musculatura firme, não solta e relaxada.
Brazil
Video game localization and marketing
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English
ativado/rígido/firme
https://www.bbc.com/portuguese/noticias/2016/02/160211_abdom...
Brazil
Extreme attention to detail is my motto
Native in: Portuguese (Variant: Brazilian)
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 1 more.
Mantenha o core ativado
Brazil
Helping global companies go local.
Native in: Portuguese (Variant: Brazilian)
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contraído
keep your core engaged → mantenha seu abdome contraído
Isso me lembra a bronca da professora de pilates "barriga pra dentro"...
Dependendo do contexto talvez "core contraído" ou "core ativado" se encaixam também...
Trecho retirado de https://www.clinicalaposture.com/post/músculos-do-core-qual-... :
[...]Core é o nome dado para o conjunto de músculos que fazem parte do complexo "lombar-pelve-abdominal-períneo-quadril", composto por 29 pares de músculos que englobam e sustentam o tronco e estabilizam a coluna. [...]
Portuguese to English, English to Portug
Native in: English
Works in: Portuguese to English, English to Portuguese
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