Took my first kickboxing class. I SUCKED. should I keep with it though?

im a healthy weight, just trying to get in shape. at my gum they have kickboxing classes and I tried one. not even halfway through the hr I felt like I was gonna puke. I was so weak ugh. it mainly felt like my heart/breathing was bad. how can I improve?
Took my first kickboxing class. I SUCKED. should I keep with it though?
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