To determine the probability that Max and Ava will get an odd number from a spinner numbered 1-8 three times in a row, we first need to establish how many of the numbers are odd.
The odd numbers in the range of 1 to 8 are: 1, 3, 5, and 7. This gives us 4 odd numbers.
Since the spinner has 8 numbers total, the probability of spinning an odd number in a single spin is: \[ P(\text{odd}) = \frac{\text{Number of odd numbers}}{\text{Total numbers}} = \frac{4}{8} = \frac{1}{2}. \]
Now, we want the probability of spinning an odd number three times in a row. Since the spins are independent, the combined probability is the product of the individual probabilities: \[ P(\text{odd three times}) = P(\text{odd}) \times P(\text{odd}) \times P(\text{odd}) = \left(\frac{1}{2}\right) \times \left(\frac{1}{2}\right) \times \left(\frac{1}{2}\right) = \left(\frac{1}{2}\right)^3 = \frac{1}{8}. \]
Thus, the probability that Max and Ava will have an odd number of push-ups three times in a row is: \[ \boxed{\frac{1}{8}}. \]
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