The way he lives so earnestly and wholeheartedly is truly admirable.
Literal
He [subject-が] single-mindedly living that figure [topic-は] truly gallant [copula-です].
直向き (ひたむき, 'single-minded, earnest, wholehearted') describes devoted effort. 生きるその姿 ('the figure of living' = 'the way he lives') uses 姿 for the visible manifestation of character. 健気 (けなげ, 'gallant, brave in hardship') is the evaluative adjective — it implies admiration for someone who tries hard despite adversity. 実に ('truly') intensifies.