The best replacement for surya namaskar is push ups.

The best alternatives to surya namaskar are rated as following:
★★★★★  push ups
★★★  chandra namaskar

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Speaking about surya namaskar, one probably shouldn't forget about mantras.

Other search terms related to surya namaskar and their ratings are:
★★★★★ mantras
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surya namaskar
push ups
chandra namaskar