What does the cryptic crossword clue "Awkward rigs constrain varied exercise (5,8)" mean?

The wordplay uses an anagram. anagram of RIGS + CONSTRAIN = CROSSTRAINING The answer is CROSSTRAINING.

Awkward rigs constrain varied exercise (5,8)

Daily Mail Cryptic #17134 | 15 Across | 2023-07-05 flower