There is such a variant of children's electric snowshoes. You can go downhill and uphill without getting off. I wish I had one of these when I was a kid.
Error message
User warning: Trying to overwrite a cache redirect for "entity_view:block:olepc_breadcrumbs:[languages:language_interface]=en:[languages:language_url]=en:[theme]=olepc:[user.permissions]=a77775cf3f10f28c688b19635d58ab4220494f651849a871f8ea42a49835a9b6" with one that has nothing in common, old one at address "languages:language_interface, theme, user.permissions, languages:language_url" was pointing to "url.path.parent, url.path.is_front", new one points to "route". in Drupal\Core\Cache\VariationCache->set() (line 238 of core/lib/Drupal/Core/Cache/VariationCache.php).
Drupal\Core\Cache\VariationCache->set() (Line: 117)
Drupal\Core\Render\RenderCache->set() (Line: 121)
Drupal\Core\Render\PlaceholderingRenderCache->set() (Line: 593)
Drupal\Core\Render\Renderer->doRender() (Line: 253)
Drupal\Core\Render\Renderer->doRenderRoot() (Line: 143)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 634)
Drupal\Core\Render\Renderer::Drupal\Core\Render\{closure}()
Fiber->start() (Line: 635)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 142)
Drupal\Core\Render\Renderer->renderInIsolation() (Line: 169)
Drupal\Core\Render\Renderer->doRenderPlaceholder() (Line: 760)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}()
Fiber->start() (Line: 768)
Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 265)
Drupal\Core\Render\Renderer->doRenderRoot() (Line: 143)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 634)
Drupal\Core\Render\Renderer::Drupal\Core\Render\{closure}()
Fiber->start() (Line: 635)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 142)
Drupal\Core\Render\Renderer->renderInIsolation() (Line: 113)
Drupal\Core\Render\Renderer->renderRoot() (Line: 253)
Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 74)
Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45)
Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() (Line: 246)
Symfony\Component\EventDispatcher\EventDispatcher::Symfony\Component\EventDispatcher\{closure}() (Line: 206)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners() (Line: 56)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch() (Line: 216)
Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 204)
Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76)
Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53)
Drupal\Core\StackMiddleware\Session->handle() (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28)
Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32)
Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 203)
Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 140)
Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 89)
Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 53)
Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 54)
Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 745)
Drupal\Core\DrupalKernel->handle() (Line: 19)