Garmin Vivofit jr 2:
https://buy.garmin.com/en-GB/GB/p/637006/pn/010-01909-16
https://www.amazon.com/s?k=vivofit+jr+2&crid=H1LTT0XEPWOT&sprefix=vivofit+%2Caps%2C235&ref=nb_sb_ss_i_6_
Have a look at all the types and pick the best one
Fitbit:
https://www.fitbit.com/uk/home
Theres lots of different types so pick the right one
Sweatcoin:
https://play.google.com/store/apps/details?id=in.sweatco.app&hl=en
Theres no link to the Apple app store but just search "sweatcoin" and it should come up
South Africa